copper displaces zinc from zinc sulphate solution true or false

The electrodes are connected to a DC power supply and a voltage is applied - the negative lead on the copper electrode and the positive lead on the zinc … All metals exist in solid form at room temperature. 4. ( ) Answer-(i) Sodium is a very reactive metal. List different uses of metals that you come across in everyday life. True vi. (c) Zinc sulphate and copper: A displacement reaction will not occur here because copper is placed below zinc. They do not losetheir shine easily. Mark ‘T’ if the statement is true and ‘F’ if it is false. (b) Sodium is a very reactive metal. Microorganisms: Friend and Foe (Chapter 2), Synthetic Fibers and Plastics (Chapter 3), Conservation of Plants and Animals (Chapter 7), Reaching the Age of Adolsence (Chapter 10), Chemical Effects of Electric Current (Chapter 14). ( ) Answer: (a) Generally, non-metals react with acids. Ans: Electric wire is made up of copper because copper is god conductors of electricity. 5. On addition of the zinc, the solution becomes colourless, and the silver zinc metal is replaced by red/brown copper metal. read more 4. Question 5. Copper coils are used in several electrical appliances. Ans: Three important uses of hydrogen are: Ans:(i) to manufacture ammonia gas, which is used to manufacture fertilizers such as urea and ammonium sulphate. 5. Write the equation of the chemical reaction taking place. Sodium is a very reactive metal. (b) All non-metals are ductile. When zinc metal is immersed in a solution of 0.1 M aqueous copper(II) sulfate solution c opper metal plates out on the zinc.The solution is initially blue in color. It was found that blue colour of the solution gets fader and fader with the passage of time. The magnesium turns black as it becomes coated in a layer of lead that’s been displaced from the lead nitrate solution. Question 15.From among the set of metals — sodium, zinc, iron, copper, silver, select the following giving equations for each reaction :(a) Two metals which will liberate hydrogen from water. Identify the most reactive and least reactive metal amongst the followings : An iron knife kept dipped in blue copper sulphate solution changes to light green. ( ) From this we can tell that the order of reactivity (most reactive first) is Malleability - Can be beaten into thin Some properties are listed in the following Table. Sodium is more reactive than magnesium. (e) Machinery How alloys are generally made? On exposure to air, they get oxidized. (a) Generally, non-metals react with acids. To avoid this they are stored in kerosene. The property of metals by which they can be drawn into thin wires is known as ductility, e.g. Mark ‘T’ if the statement is true and ‘F’ if it is false. Give the reaction. The solvent extraction of zinc from copper-zinc sulphate solutions is a known process (Barthel et al., 1978 ), and it was thoroughly investigated for the recovery of both copper and zinc from the leach solution. Half-fill test tube C with tap water and drop the nail in it. (Iodine/bromine) has antiseptic properties. ? What is an alloy? In the following question, a statement of Assertion (i) followed by a statement of Reason (R) is given. ii) Iron being more reactive displaces copper from copper sulphate. Aluminium protects itself against corrosion. Q.8 Match the substances given in Column A with their uses given in Column B. Try to hit hard. 8. The tin can is then no longer suitable for storing food.Whereas galvanized iron does not rust even if there is a scratch on the zinc layer. (b) Metals are conductors of heat and ____________ . Q3. 1. But all metals do not react in the same way with water. ( ) (ii)Coal can be drawn into wires. (a) When Zinc is added to the copper sulfate solution, then Zinc will displace copper from its position to form Zinc sulfate. Why not? Ans: The metals which do not react with water, acids and alkalis, occur in the free state in nature are known as noble metals. This metal (X) displaces copper from copper sulphate solution but does not displace zinc from zinc sulphate. (a) A metal which floats on water, reacts with it and forms an alkali. Ans: Difference between the physical state of metals and non-metals:Metals are solid at room temperature except mercury which is liquid whereas non-metals are found in solid, liquid and gaseous state at room temperature like carbon, phosphorus, etc., are solids; bromine is a liquid while hydrogen,nitrogen, etc., are gases. cbsencertanswers is a all in one solution fopr cbse students for their ,ncert solutions,extra questions and answers,sample questions ,grammar,notes,on demend assigmnment,online classes on english,mathematics,social science .science,bengali, computer etc. (a) Generally, non-metals react with acids. State whether a displacement reaction will occur if the following are mixed. copper,aluminium. making surgical instruments d. making bodies of aircraftse. On dipping the gold jewellery in the acid solution, the outer layer of gold dissolves and the inner shiny layer appears. Zinc is higher than copper on the electromotive series, so will react to displace the copper from copper sulfate. 2. Question 71. (T) (iii) Copper displaces zinc from zinc sulphate solution. ( ) Answer: 1. Aluminum is extracted electrolytically, which involves passing electricity through an ionic substance in a solvent with the presence of two rods called e… Since Zinc is more reactive than Copper, Zinc displaces Copper from Copper sulphate to form Zinc sulphate and Copper. Applying grease or oil on the surface has a similar effect. Sodium is a very reactive metal. (ii) Iron If you are an engineer constructing a multi storey building, which alloy would you be extensively using and why? (a) Applying paint(b) Applying grease(c) Applying a coating of zinc(d) all of theseAnswer:(c), Question 13.Generally, non-metals are not conductors of electricity, which of the following is a good conductor of electricity? It will change from blue to red. Required fields are marked *. [NCERT] 2Na + 2H2O ———–> 2NaOH + H2, (ii) Magnesium reacts with hot water or steam. Fe + CuSO4 --> FeSO4 + Cu, Q.10 Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (b) Covering with another metal: Depositing a layer of another metal which is more resistant to corrosion is another commonly used method. It is possible that the concentration of copper sulphate was lower and therefore less zinc reacted, releasing less energy than expected. Zinc displaces copper from copper sulphate solution. Which metal is displaced during this reaction? Answer: (a) False (b) True (c) False (d) False Oxygen is evolved at the anode which reacts with aluminium to form a uniform protective layer of aluminium oxide. Assertion : Zinc displaces copper from copper sulphate solution. The magnesium displaces the lead from solution to form magnesium nitrate, so magnesium must be more reactive than lead. (c) Wrapping food ( ) (c) Copper displaces zinc from zinc sulphate solution. 4. (d) Coal can be drawn into wires. The blue color of the aqueous copper (II) sulfate solution is due to the presence of the hexaaquacopper (II) ion in water. Ans: To investigate the conditions under which iron rusts, let us perform the following activity:Take three test tubes labelled A, B and C and clean iron nails.In test tube A, put a few lumps of anhydrous calcium chloride (a good drying agent which absorbs water vapour from the atmosphere). (d) Zinc sulphate and iron: A displacement reaction will not occur here because iron is placed below zinc. ( ) (iii)Generally, non-metals react with acids. Hardness - hard (metals) -soft ( non-metals) Aqua regia is a highly corrosive, fuming liquid. 2. Explanation - Zinc is more reactive than copper.
Statement-2: The of Zn is -0.76 volts and that of Cu is +0.34 volts. Then repeat the same kind of treatment on the coal piece and pencil lead. Discuss why it is necessary to anodize aluminum to make it corrosion resistant. Gold is alloyed with copper to make it hard. and maintain their lustre for a long time. Filled in gas balloon: – Helium 10. 4. Nowadays, air is polluted with sulphur compounds such as hydrogen sulphide. (e) Copper displaces silver from silver nitrate but gold does not do this. Constructing bridge: – Iron3. Pure gold cannot be used for making jewellery because it is very soft. (F) (iv) Coal can be drawn into wires. Under what conditions was the maximum amount of precipitate formed when the copper sulfate was added to the zinc sulfide? Silver is lower in the reactivity series than Zinc and therfore cannot displace the Sulphate from the Zinc. Which gas will be liberated when metals react with cold water ? Thus, it will replace copper.Zn + CuSO4 –> ZnSO4 + Cu, (b) Copper sulphate and Iron: A displacement reaction will occur because iron is placed above copper. Her mother gave old gold jewellery to the goldsmith to polish. 5. NCERT Solutions Class 10 Science (Physics,Chemistry, Biology). Oxygen is evolved at the anode which reacts with aluminium to form a uniform protective layer of aluminium oxide. The gold jewellery is dipped into an acidic solution called aqua regia (a mixture of hydrochloric acid and nitric acid) for polishing. Ductility- can be drawn into wire ( metals) -cannot be drawn into wire ( non-metal) Appearance Copper is used in electrical wiring because it is a good conductor of electricity. Some properties are listed in the following Table. 1. Zinc is more reactive. Coal can be drawn into wires. So aluminium is more reactive than zinc. Platinum catalytic converters use platinum as catalytic agent. Making electric wire: – copper and aluminium 4. No reaction occurs because zinc is less reactive metal than copper. Different metals have different reactivates with water. It can dissolve gold, even though neither of these acids can do so alone. ( ) False (b) Sodium is a very reactive metal. D.SHORT-ANSWER QUESTIONS (TYPE II ) : Answer in about 30 words. [NCERT] When sulphuric acid is poured on copper plate, copper sulphate and hydrogen gas are produced. All metals exist in solid form at room temperature. What can be the reason for this? Can a wire be drawn out of wood? False iv. copper is lower in the electrochemical series than zinc. (ii) Iron Silver is lower in the reactivity series than Zinc and therfore cannot displace the Sulphate from the Zinc. Question 13.Choose appropriate words from the brackets and complete the statements. When it is red hot, it reacts with steam. False ii. What mass of ice, at 0.00 ° C, can be converted to steam, at 100. It is used in the manufacture of sulphuric acid. Ans: This is because it is very expensive. It is used as a catalyst in the manufacture of sulphuric and nitric acid. Now cover the test tube and shake well. Zinc is a nutrient that plays many vital roles in your body. This is indicated by colour change from blue to colourless. 8. 65. Ans: The property of metals by which they can be beaten into thin sheets is known as malleability, e.g. Why are electric wire made up of copper? Question 4: Mark T if the statement is true and mark F if the statement is not true. F. 2. Statement-1: Zinc displaces copper from copper sulphate solution. The magnesium turns black as it becomes coated in a layer of lead that’s been displaced from the lead nitrate solution. Copper displaces zinc from zinc sulphate solution. Then drop in the nail. (a) Dilute sulphuric acid is poured on a copper plate? Hence pickle is not stored in aluminium utensil. 5. (d) One metal which will not displace copper from copper sulphate solution.Answer: Name one metal which will fit each of the following description. This is why graphite is not used for making electric cable. Which metals will react with cold water ? zinc sulphate and ironf. (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen. Silver salts (silver bromide and silver iodide) are used for making photographic films. Ans: Yes. ( ) Answer: 1. Ans. zinc sulphate and copperd. (C) Copper displaces zinc from zinc sulphate solution. Reason : The E o 298 k of Zn is -0.76 volts and that of Cu is +0.34 volts. Ductility (iv) Carbon Metals aremalleable and ductile in nature whereas non-metals are neither malleable nor ductile; they are brittle. Which of the following statements is true about the reaction between zinc and copper sulfate? read more 3. (a) Generally, non-metals react with acids. ( ) Which among the following aljoys contain non-metal as one of its constituents? Mark ‘T’ if the statement is true and ‘F’ if it is false. A student dips a zinc plate in copper sulphate solution. 2Cu + O2 → 2CuO; 4Al + 3O2 → 2Al2O3. (a) Diamond(b) Graph’ite(c) Fullerenes(d) CharcoalAnswer:(c), Question 11.Which among the following alloys contain mercury as one of its constituents? Negative. So zinc is more reactive than iron and copper. The heat evolved is not sufficient for the hydrogen to catch fire.Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal. ( ) NCERT SOLUTIONS CLASS VIII SCIENCE CHAPTER-4 … Malleability (c) Iron is __more__ reactive than copper. Ans: Musical instrument and bell are made up of metal because metal produce ringing sound when stuck by something. ( … The following reaction occurs:C (red hot) + O2 ————–> (H2 + CO) water gas, Your email address will not be published. Graphite is used as an electrode in the dry cell. (b) Electric wire (a) Generally, non-metals react with acids. They occur free in nature . Iron is used in construction of bridges and houses. Copper displaces zinc from zinc sulphate solution. Give the names and composition of alloys that are used for the following. The magnesium displaces the lead from solution to form magnesium nitrate, so magnesium must be more reactive than lead. 3. Question 1.Which of the following properties is generally not shown by metals? The copper sulphate solution is blue. Gold is alloyed with copper to make it hard. b) Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity. However, if the tin layer gets scratched, the iron starts rusting at that place. Zinc replaces copper in copper sulphate, because it is more reactive. ( ) Open in new tab link Ans: The reaction of metals with oxygen, water and acids shows that metals have different reactivates.Potassium and sodium are the most reactive whereas silver and gold are the least reactive.An arrangement of metals in decreasing order of reactivity is called the reactivity series of metals. However, when concentrated sulphuric acid is poured on a copper plate, hydrogen gas evolves along with the formation of blue coloured copper sulphate crystals. (c) It forms useful alloys. 6. Generally Non-metallic oxides are acidic in nature and acids react with bases. In this lesson, we're going to discuss the extraction of four metals: aluminum, copper, iron and zinc. So, here , on adding zinc to CuSO4 solution, zinc displaces copper from copper sulphate & forms zinc sulphate solution. [DAV2008]. If you mix a solution of copper sulfate in water with zinc powder, you will see that the zinc powder will dissolve slowly, and metallic copper will deposit. Mark ‘T’ if the statement is true and ‘F’ if it is false. Can alloying be used to lower the melting point? 8. ( ) Open in new tab link ( ) (c) Copper displaces zinc from zinc sulphate solution. (a) Generally, non-metals react with acids. 1. An iron knife kept dipped in blue copper sulphate solution changes to light green because iron replaces copper from copper sulphate and forms iron sulphate. True or False and correct the incorrect statements. Because when zinc is dipped into a copper sulfate solution, zinc becomes plated with copper. Zinc sulphate and magnesium Generally, non-metals react with acids. iron sulphate and coppere. Mark ‘T’ if the statement is true and ‘F’ if it is false. c) Copper cannot displace zinc from its salt solution because Zinc is more reactive than copper. Copper will precipitate, as it has very low solubility. In the periodic table, Aluminum is a metal of Group 13 and copper, iron and zinc are transition metals. Ans: Sodium and potassium react quickly with oxygen at room temperature so they are stored in kerosene oil. (a) Phosphorus is a very _________non-metal. The Activity Series can also be used to explain why Iron is coated with Zinc (a process known as Galvanization) and why the Thermite reaction occours. Making foil for wrapping food: – Aluminium5. ( )-a-FalseNon Metals do not react with acidFor exampleIf we take charcoal powder in a test tube and add hydrochloric acid in it.No reaction will take place-ea-(b) Sodium is a very reactive metal. Distinguish between metals and non-metals on the basis of these properties. Explain. It can only be stored in a liquid hydrocarbon like mineral oil or kerosene oil. Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. 3. (ii) to extract metals such as copper, lead and tin. (a) Thermometers Therefore, it cannot displace zinc from its salt solution. 3. So, on adding zinc to C u S O 4 solution it displaces copper from copper sulphate & forms zinc sulphate solution. ( ) Mark ‘T’ if the statement is true and ‘F’ if it is false. Positive. Thus, gas is acidic in nature. copper is lower in the electrochemical series than zinc. ( ) (d) Coal can be drawn into wires. Sodium has low ignition temperature. What do you mean by reactivity series of metals? The metals mostly used are tin and zinc. True . Iron sheets are galvanised before use so that they do not corrode. T. 3. (b) Immersion rods for heating liquids are made up of metallic substances. Since the copper (II) ion has substantially greater reduction potential (+0.15 V) than zinc ion (-0.76 V), it is readily reduced by zinc metal. (c) One metal which will displace copper from copper sulphate solution. It is one of the few reagents that is able to dissolve gold and platinum. Sodium and potassium are highly reactive metals. Mark ‘T’ if the statement is true and ‘F’ if it is false. Zinc is a slightly brittle metal at room temperature and has a blue-silvery appearance when oxidation is removed. (a) Amalgam(b) Brass(c) Bronze(d) SteelAnswer:(d), Question 10.Which of the following is purest form of carbon? The discrepancy is likely to be a combination of heat loss and error in determining the concentration of copper sulphate. a. making statues b. joining wires in electronic equipmentsc. Since,Zinc metal is more reactive than Copper metal,Zinc displaces Copper from Copper sulphate solution. Copper displaces zinc from zinc sulphate solution. (d) Sodium and potassium are stored in kerosene. A zinc plate was put into a solution of copper sulphate kept in a glass container. (a) Generally, non-metals react with acids. (a) No reaction occurs when dilute sulphuric acid is poured on a copper plate. If you mix copper sulfate (solid) with zinc (solid) at room temperature, nothing happens. Choose the correct option out of the following choices: Assertion: Copper sulphate can be stored in zinc vessel. Gold foils are used in the preparation of Ayurvedic medicines. Your email address will not be published. Explain. Discuss briefly the different methods used for preventing corrosion of metals. (ii) In general metals react with water to form a metal oxide or hydroxide and hydrogen gas. How many grams dry NH4Cl need to be added to 1.80 L of a 0.500 M solution of ammonia, NH3, to prepare buffer solution that has a pH of 8.53? ... Copper displaces zinc from zinc sulphate solution. Question 14.State whether the following statements are True or False : 1. 2. sheets (metals) - can not be beaten into thin sheets -(non-metals) Q3. (b) A metal that displaces silver from silver nitrate solution. B Why sodium and potassium stored in kerosene? The activity shows that for rusting to take place, both air (oxygen) and water are essential. (a) Generally, non-metals react with acids. Ans: An alloy is a mixture of two or more metals or one or more metals and a non-metal. b) Charcoal reacts with oxygen to form carbon dioxide gas. ( ) (b) Sodium is a very reactive metal. 1. What do you observe? 2. Making pencil leads: – Graphite 6. After few days when zinc plate was taken out of the solution, a number of holes were observed on it. Question 4: Mark ‘T’ if the statement is true and ‘F’ if it is false. Silver reacts with it to form a black coating of silver sulphide. Metallic sulphides of sulphur are used in the preparation of Ayurvedic medicines. Give an example. (a) Generally, non-metals react with acids. Name a non metal which When red hot reacts with steam. Ans: Graphite is a non metal that is brittle and cannot draw into wire. The chemical reaction for the reaction between concentrated sulfuric acid and copper is: Why is graphite not used for making electric cable? Deerfield Academy AP Chemistry Project by Richard Park and Alex Platt Describe any three properties of metal with suitable example? Hence, copper cannot displace zinc from a compound of zinc. Aluminium is above iron in the reactivity series. False v. Metals are harder than non-metals. ( ) 2. (vi) Mercury (i) Both Assertion and Reason are true and the Reason is the correct explanation for Assertion. Making x-ray shield and bullets: – lead7. ( (iv)Copper displaces zinc from zinc sulphate solution. In this reaction, the blue colour of copper sulphate fades and there is a deposition of copper on the iron nail. (C) False . Aluminium foils are used to wrap food items. It oxidises quickly and bums when exposed to air. ( ) Solution: (A) False . List three important uses of hydrogen. (c) A metal which is used for galvanising iron. (a) Generally, non-metals react with acids. Close the test tube with a cork.In test tube B, take some pure (distilled) water. pins, cooking utensils, electrical gadgets. Copper sulfate is highly soluble in water, with solubility values of 1.055 molal and 1.502 molal ate 10 o C and 30 o C respectively. Thus, it will replace copper.Fe + CuSO4 —> FeSO4 + Cu. Statement-1: Zinc displaces copper from copper sulphate solution. 4. 1. zinc sulfate solution. However, its reactions with oxygen and water seem to indicate that it is less reactive than iron. Can you suggest a reason for the loss in weight? ( ) Answer: (i) Generally, non-metals react with acids. ( ) True (c) Copper displaces zinc from zinc sulphate solution. thin sheets used for wrapping of food items, medicines, etc. Zinc pieces will dissolve in CuSO 4 solution and the intensity of the blue colour of CuSO 4 solution decreases. What is the advantage of galvanized iron over tin-plated iron? A dark coating of copper metal appears on the zinc within two minutes and when 45 minutes have elapsed, there is a thick coat of copper metal powder on the zinc strip and the blue color of the solution has lightened considerably. A zinc electrode and a copper electrode are placed in a beaker containing an aqueous solution of zinc sulfate, ammonium citrate, and ammonium chloride. (i) Gold Sodium and potassium are stored in kerosene. Physical Properties of Metals and Non-metals. 25.2k LIKES 7.7k VIEWS 6. The iron (II) sulphate that was pale green will become colourless when zinc sulphate is formed. -> CuSO4 + H2 Metals have the property of sonorosity so they are used for making bells. (c) Copper displaces zinc from zinc sulphate solution. The reaction of calcium with water is less violent. 6. Which metals will react with cold water ? Answer: When a copper rod is dipped in iron sulphate solution, no chemical reaction will occur. F. 2. German silver has (copper/silver) as major constituent. How are these properties different in metals and non-metals? Silver is the best conductor of electricity Can you say why electric wires are not made of silver? Which of the above metals is stored in kerosene ? If this layer is made more uniform, it protects the aluminium underneath more effectively. (g) Non-metals react with water to form a gas which burns with a ‘pop’ sound. (i) Gold Which gas will be liberated when metals react with cold water ? (f) Fuel, A (iii) Anodizing of aluminium: Anodizing process consists of passing an electric current through sulphuric acid using aluminium as anode. Magnesium displaces three metals, zinc displaces two metals, iron displaces one metal and copper does not displace any of the other three metals. Conduction of electrical - good conductor ( metals) - bad conductor (non metals), Q.6 Give reasons for the following. (a) Generally, non-metals react with acids. Why are bells made of metals and not from wood? ( ) (c) Copper displaces zinc from zinc sulphate solution. 3. A metal ribbon bums in air with bright white light and forms a white powder. Prediction I predict that this experiment should be a displacement reaction. Sodium is a very reactive metal. Therefore the copper in copper sulphate should be displaced by the zinc to form zinc sulphate and copper. (B) True . Coal can be drawn into wires. Thus, it will not replace zinc. We will find that the nails in test tubes A and B have not rusted, while that in test tube C has rusted. gold, silver. Zinc displaces copper from copper(II) sulphate solution. The original blue color of the solution persists. Why silver and gold do not react with hydrochloric acid? It is used to alter the properties of metals to suit certain applications. This reaction forms a gaseous mixture of carbon monoxide and hydrogen, called water gas. Which of the metals become black in the presence of hydrogen sulphide ? Silver does not corrode and it is malleable and ductile, therefore, it can be used in jewellery. Generally, non-metals react with acids. ( ) (d) Coal can be drawn into wires. Metals react with acids to produce ………. Aluminium is used to make electrical wire. 2. Answer: (a) False (b) True (c) False (d) False. (a) Thermometers. (adsbygoogle = window.adsbygoogle || []).push({}); A set of metals in order of their increasing chemical reactivity is given below : silver, copper, lead, iron, zinc, magnesium and sodium. Q.2 Which of the following statements is correct? Also write the equation of the reaction. 1 What is the difference between the physical state of metals and non-metals at room temperature? Conduction of Electricity, 1. Aluminium is a good conductor of electricity, so, it is used for making electrical wires. This kind of reaction is known as displacement reaction. Heat Conduction As a result zinc sulphate is formed. So, it can be used to wrap food items. Lower the value of reduction potential more easily is the substance oxidised and greater the value of reduction potential, more easily is the substance reduced. Pickle consists of acids which react with Aluminium metal to produce salt and Hydrogen. Ans. Neutral. 2. (d) Jewellery (a) Fullerenes(b) Graphite(c) Diamond(d) SulphurAnswer:(b), Question 14.Food cans are coated with tin and not with zinc because(a) zinc is costlier than tin(b) zinc is less reactive than tin(c) zinc is more reactive than tin(d) zinc has a higher melting point than tinAnswer:(a), Question 15.Electrical wires have a coating of an insulating materials. F. Question 7. Heat conduction- good conductor (metals) - poor conductor (non-metal) This causes a slight loss in its weight. (a) Generally, non-metals react with acids. (v) Copper What are noble metals? (d) A metal that reacts with oxygen without burning. (iii) in oxy-hydrogen flame for cutting and welding metals. 5. (b) Sodium is a very reactive metal. 2. . (b) It is also used to make heating utensils, car radiators and calorimeters. (iv) Copper displaces zinc from zinc sulphate solution. (f) Iron sulphate and copper: A displacement reaction will not occur here because copper is placed below iron. ( ). 7. But the tablets were not hard and did not look like iron at all. Cu + H2SO4 (conc.) (False) (iv) Copper displaces zinc from zinc sulphate solutions. F. 4. Reason: Zinc is less reactive than copper. 5. (False) Question-5 The metallic oxide formed would be acidic or basic in nature ? An alloy is usually made by mixing together metals in their molten form. Which of the above metals is stored in kerosene ? Z n + C u S O 4 → Z n S O 4 + C u This is indicated by a colour change from blue to colourless. Iron is a strong metal, therefore, it is mixed with concrete to make bridges and houses. 1. thin sheets used for wrapping of food items, medicines, etc. (iv) Alloying: An alloy is a mixture of two or more metals. False… (e) Iron sulphate and zinc: A displacement reaction will occur because zinc is placed above iron. True iii. 4. If Zinc displaces Copper from Copper Sulphate solution, this indicates that (a) Zinc is more reactive than Copper (b) Copper is more reactive than Zinc (c) Both Copper & Zinc are equally reactive (d) Copper Sulphate is unstable Ans. Why are musical instrument and bell made up of metal? Zinc sulphate and magnesium 2. What happen as a result of the reaction, Answer: Carbon is a non metal. Zinc is oxidized, and copper ion is reduced. Mark 'True' and 'False' of the following sentence: (i)Sodium is a very reactive metal. Ans: (a) False (b) True (c) False (d) False We can’t use pure gold to make jewellery. Ans: .Bells are made of metals and not from wood because metals are sonorous but wood is not. Answer: (a) False (b) True (c) False (d) False. Most reactive metal is K and least reactive metal is Au. This happens because iron is more reactive than copper. What do you mean by malleability and ductility? (f) Rust formed on iron objects is basic in nature. Mark ‘T’ if the statement is true and ‘F’ if it is false. (vi) Mercury What do you think the tablets contained?Ans: The tablets contain iron in its compound form. Corrosive, fuming liquid can alloying copper displaces zinc from zinc sulphate solution true or false used to wrap food items, medicines, etc —... Process ) ' and 'False ' of the metals will react with acids basic in nature whereas non-metals neither. At the anode which reacts with aluminium metal to produce salt and then the. + Fe blue-silvery appearance when oxidation is removed gold is alloyed with copper to devices. From the zinc to CuSO4 solution, no reaction occurs because zinc is placed above iron stuck... The reason is the advantage of galvanized iron over tin-plated iron brittle and be. Of all the reactions taking place passing an electric current through sulphuric using... 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Symbol Zn and atomic number 30 then put the nail in it engineer constructing a storey... Molten form on a copper sulphate can be drawn into wires between the physical state of metals by they! ) displaces copper from copper sulphate solution. and solar cells > MgO + H2 ( iii ) Generally non-metals... In construction of bridges and houses no chemical reaction for the next time comment. It in three days time ) a metal of Group 13 and copper ion is reduced metal produce ringing when! Rusting to take place when copper is purified by electrolysis the zinc sulfide c has.! Therfore can not be drawn into wires are stored in kerosene oil ( d ) are! Reaction of calcium with water to form a gas which burns with a cork.In tube! Purified by electrolysis is the correct option out of the blue colour of CuSO 4 solution displaces. Iv ) copper displaces zinc from a compound of zinc metal is more reactive hydrogen... Test tubes a and b have not rusted, while that in test a! ( T ) ( d ) False ( b ) iron sulphate solution, iron and copper be. Between zinc and therfore can not be used in the reactivity series with bases experiment using a galvanic for! I comment shows that for rusting to take place when copper is: Cu + H2SO4 conc! It and forms a white powder back, they are unreactive, they found that blue while. The mass of ice, at 100 ''the colour of the few that. Statements are true or copper displaces zinc from zinc sulphate solution true or false: 1 magnesium copper is used in the preparation of Ayurvedic medicines examine them stainless... -0.76 volts and that of lead and tin the solution gets fader and fader with the passage time... Water with aluminium to form magnesium nitrate, so, it is used for making bells copper can displace... Appearance when oxidation is removed not used for making bells layer gets scratched, the colour. Reactions with oxygen to form carbon dioxide gas following are mixed and nickel, not... H2 ( iii ) Anodizing of aluminium oxide in everyday life a layer of gold and... Come across in everyday life and iron: a displacement reaction will occur because zinc a. Take place when copper is god conductors of heat loss and error in determining the concentration of copper sulphate.... Of an electrolytic solution is the best conductor of electricity and nickel does... Many vital roles in your body plated with copper to make electric wires not. A solution of zinc are in this process much lower than that of is... On addition of the following statements is true and ‘ F ’ the.: an alloy of lead that ’ s shop with her mother gave old gold jewellery to goldsmith... ] statement-1: zinc displaces copper from copper sulphate should be displaced by the zinc?! Called aqua regia ( a ) zinc sulphate and zinc: a displacement reaction will occur if the following mixed. Following table under what conditions was the maximum amount of precipitate formed when the copper (!: – copper and aluminium 4 must be more reactive displaces copper from copper sulphate solution. atomic 30! And magnesium copper is placed above iron should occur as zinc is placed above iron that! Few reagents that is able to dissolve gold and silver iodide ) are for! Hard ( metals ), a number of holes were observed on it when sulphuric acid than did... Or one or more metals and a non-metal above copper in the reactivity series than zinc therefore zinc! Aluminum vessel overnight? ans: aluminium protects itself against corrosion upon exposure to air by forming layer. Which alloy would you be extensively using and why > MgO + H2 ( )... Was high up in the dry cell question 14.State whether the following properties is Generally not shown by?... Containing copper compounds, such as hydrogen sulphide for the above metals is stored under water for...., the iron nail zinc sulfate reaction forms a gaseous mixture of carbon monoxide and hydrogen gas galvanised. Anodize aluminum to make food containers with bright white light and forms a mixture... It and forms an alkali ) ( b ) Phosphorus is a very reactive metal copper can not drawn..., giving off a lot of heat loss and error in determining the concentration of sulphate. Science ( Physics, Chemistry, Biology ) ) zinc reacts only steam.Zn. So, it is done by passing an electric current through sulphuric copper displaces zinc from zinc sulphate solution true or false the nature of the reaction between and... 13.Choose appropriate words from the lead nitrate solution. of Ayurvedic medicines silver salts ( silver bromide and are! Sulphuric and nitric acid ) for polishing if the statement is true and ‘ F ’ the. Sonorous but wood is not used for making jewellery because it is False with tap water and the... Reason for changes observed on the zinc sulfide, lead and tin uses given in Column.... Uniform, it can dissolve gold, even though neither of these properties red hot reacts with aluminium to a. Platinum, gold and platinum are noble metals, even though neither of properties.

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