1. Zinc can displace copper from copper sulphate solution and iron from ferrous sulphate solution. Q.1 Which of the following can be beaten into thin sheets? (a) Ductility(b) Sonorous(c) Dullness(d) Electrical conductionAnswer:(c), Question 2.The most abundant element in the universe is(a) hydrogen(b) oxygen(c) helium(d) carbonAnswer:(a), Question 3.The ability of metals to be drawn into wires is known as(a) ductility(b) conductivity(c) malleability(d) sonorousityAnswer:(a), Question 4.The most abundant element in the earth crust is(a) iron(b) oxygen(c) silicon(d) aluminiumAnswer:(b), Question 5.Galvanisation is a method qf protecting iron from rusting by coating with a thin layer of(a) silver(b) galium(c) zinc(d) aluminiumAnswer:(c), Question 6.The most abundant ihetal in earth crust is(a) Cu(b) Al(c) Fe(d) ZnAnswer:(b), Question 7.An alloy is(a) a compound(b) a heterogeneous mixture(c) a homogeneous mixture(d) an elementAnswer:(c), Question 8.In extraction of copper, the flux used is(a) FeO(b) Si02(c) CaO(d) FeSi03Answer:(b), Question 9.Alloys are homogeneous mixtures of a metal with a metal or non-metal. Question 4: Mark ‘T’ if the statement is true and ‘F’ if it is false. FeSO 4 (aq) + Zn (s) → ZnSO 4 (aq) + Fe (s). As a result zinc sulphate is formed. Ans 4: (a) Generally, non-metals react with acids (b) Sodium is a very reactive metal (c) Copper displaces zinc from zinc sulphate solution (d) Coal can be drawn into thin wires . This method can be done by the following ways: (i) Galvanizing: Clean iron sheets are dipped in molten zinc to deposit a layer of zinc on it. Zinc is oxidized, and copper ion is reduced. Aluminium is a good conductor of electricity, so, it is used for making electrical wires. copper is lower in the electrochemical series than zinc. ( ) False (b) Sodium is a very reactive metal. Under what conditions was the maximum amount of precipitate formed when the copper sulfate was added to the zinc sulfide? Ans: Yes. 1. Hardness - hard (metals) -soft ( non-metals) Hence pickle is not stored in aluminium utensil. The blue color of the aqueous copper (II) sulfate solution is due to the presence of the hexaaquacopper (II) ion in water. Copper cannot displace zinc from its salt solution. Silver is lower in the reactivity series than Zinc and therfore cannot displace the Sulphate from the Zinc. D.SHORT-ANSWER QUESTIONS (TYPE II ) : Answer in about 30 words. The material, generally used is(a) sulphur(b) graphite(c) PVC(d) none of theseAnswer:(c), Question 16.Which of the following non-metals is a liquid? (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen. List three important uses of hydrogen. Silver salts (silver bromide and silver iodide) are used for making photographic films. This causes a slight loss in its weight. ii) Iron being more reactive displaces copper from copper sulphate. 1. gas. ( ) (ii)Coal can be drawn into wires. 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 … It has been noticed that silverware becomes black faster today than it did fifty years ago. ( ) (d) Coal can be drawn into wires. Can you suggest a reason for the loss in weight? ... Copper cannot displace zinc from its salt solution… ... Copper displaces zinc from zinc sulphate solution. All metals exist in solid form at room temperature. (a) Generally, non-metals react with acids. (a) Phosphorus is a very __reactive__ non-metal. After shaking, test the solution with blue litmus. They are also sometimes made by mixing metal powders together. Applying grease or oil on the surface has a similar effect. The metallic oxide formed would be acidic or basic in nature ? The two metals which … Choose the correct option out of the following choices: Assertion: Copper sulphate can be stored in zinc vessel. Fe + CuSO4 --> FeSO4 + Cu, Q.10 Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. On addition of the zinc, the solution becomes colourless, and the silver zinc metal is replaced by red/brown copper metal. Coal can be drawn into wires. a) Aluminium is malleable and can be drawn into thin sheets hence Aluminium foils are used to wrap food items 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. Cu + ZnSo4 ---> No reaction. Write word equations of the reactions involved. 6. (a) Generally, non-metals react with acids. The discrepancy is likely to be a combination of heat loss and error in determining the concentration of copper sulphate. 5. Why are bells made of metals and not from wood? The following reaction occurs:C (red hot) + O2 ————–> (H2 + CO) water gas, Your email address will not be published. Answer: (a) False (b) True (c) False (d) False A typical example of a single displacement reaction where one metal displaces another is the reaction between iron and copper sulfate, given by the reaction Fe + CuSO 4 → FeSO 4 + Cu. iron sulphate and coppere. Name two metals which are soft and can be easily cut with a knife. Dilute sulphuric acid is poured on copper plate ? (a) Generally, non-metals react with acids. Question 4: Mark T if the statement is true and mark F if the statement is not true. Ans: (a) False (b) True (c) False (d) False Her mother gave old gold jewellery to the goldsmith to polish. Therefore, it cannot displace zinc from its salt solution. Conduction of electrical - good conductor ( metals) - bad conductor (non metals), Q.6 Give reasons for the following. Which of the metals become black in the presence of hydrogen sulphide ? It will change from blue to red. (a) Generally, non-metals react with acids. In general, metals are extracted from their ore, which is a naturally occurring substance. ( ) (iii)Generally, non-metals react with acids. Then drop in the nail. Question 5. Positive. (i) Both Assertion and Reason are true and the Reason is the correct explanation for Assertion. read more What is an alloy? (b) Write down word equations of all the reactions taking place in this process. Which among the following aljoys contain non-metal as one of its constituents? All reactants and … a. making statues b. joining wires in electronic equipmentsc. Ans: (i) Metals combine with oxygen to form metal oxides.Eg. Zinc displaces copper from copper(II) sulphate solution. (d) Jewellery Boil it for one minute to remove any dissolved air. If a galvanic cell is prepared correctly, what would the initial multimeter reading be? Close the test tube with a cork. (b) Iron nails are placed in a copper sulphate solution? (iv) Carbon 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. (i) Gold Question 1.Which of the following properties is generally not shown by metals? Which gas will be liberated when metals react with cold water ? They are:(a) Painting or applying oil: Painting the surface of the metal after cleaning it thoroughly is the most common method which keeps air away. 3. ( ) True (c) Copper displaces zinc from zinc sulphate solution. 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. Making pencil leads: – Graphite 6. Copper displaces zinc from zinc sulphate solution. Ductility- can be drawn into wire ( metals) -cannot be drawn into wire ( non-metal) 3. So, here , on adding zinc to CuSO4 solution, zinc displaces copper from copper sulphate & forms zinc sulphate solution. ( ) (d) Coal can be drawn into wires. Discuss briefly the different methods used for preventing corrosion of metals. 2. Describe any three properties of metal with suitable example? 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. 1. 6 Answers. Iron sheets are galvanised before use so that they do not corrode. Which metals will react with cold water ? (e) A metal that bums in oxygen with a bright light.Answer: (d) Metals react with acids to produce ____________ gas. copper sulphate solution exists as cu+2 and so4-2 as it is a strong electrolyte.So,when copper sulphate solution is reacted with zinc powder, zinc displaces copper from copper sulphate. A student dips a zinc plate in copper sulphate solution. It can dissolve gold, even though neither of these acids can do so alone. Metals like K and Na react vigorously with cold water to form hydrogen gas. (d) Zinc sulphate and iron: A displacement reaction will not occur here because iron is placed below zinc.
Statement-2: The of Zn is -0.76 volts and that of Cu is +0.34 volts. Making x-ray shield and bullets: – lead7. (f) Rust formed on iron objects is basic in nature. Is the solution acidic or basic? copper is lower in the electrochemical series than zinc. This should occur as zinc is higher in the reactivity series than copper. 6. Hence, copper cannot displace zinc from a compound of zinc. (b) Covering with another metal: Depositing a layer of another metal which is more resistant to corrosion is another commonly used method. (a) Generally, non-metals react with acids. The metals copper, silver gold and … (False) Question-5 (a) Phosphorus is a very _________non-metal. To avoid this they are stored in kerosene. 1:12 25.2k LIKES Half-fill test tube C with tap water and drop the nail in it. zinc sulphate and ironf. A copper spoon had fallen into a container containing dil.HCl. In the following question, a statement of Assertion (i) followed by a statement of Reason (R) is given. When iron nails are placed in copper sulphate solution, iron sulphate and copper are formed. Coal can be drawn into wires. (c) Copper cannot displace zinc from its salt solution. Q.9 What happens when making accurate laboratory balances f. making bodies of ships, Ans. (d) Coal can be drawn into wires. Which of the metals will react with oxygen when heated ? (f) Fuel Give three examples of reactions between metals and water, to show that different metals have different relativities. Describe an experiment to show the conditions necessary for rusting of iron. How are these properties different in metals and non-metals? Ans: .Bells are made of metals and not from wood because metals are sonorous but wood is not. Aluminium is used to make electrical wire. Statement-1: Zinc displaces copper from copper sulphate solution. 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. This happens because iron is more reactive than copper. We will find that the nails in test tubes A and B have not rusted, while that in test tube C has rusted. The gold jewellery is dipped into an acidic solution called aqua regia (a mixture of hydrochloric acid and nitric acid) for polishing. Answer: (a) False (b) True (c) False (d) False. [ ] (d) Coal can be drawn into wires. 1 What is the difference between the physical state of metals and non-metals at room temperature? Answer: Copper is less reactive than zinc. 4. Metallic sulphides of sulphur are used in the preparation of Ayurvedic medicines. Copper displaces zinc from zinc sulphate solution. It is used in the manufacture of sulphuric acid. Which of the above metals is stored in kerosene ? But the tablets were not hard and did not look like iron at all. Mark ‘T’ if the statement is true and ‘F’ if it is false. Aluminium foils are used to wrap food items. Give the equation of the reaction taking place. Also write the equation of the reaction. Ans: Tin is electroplated on iron to make food containers. (d) Metals react with acids to produce __hydrogen__ gas. Why are they used to make ornaments? Physical Properties of Metals and Non-metals. Metals have the property of sonorosity so they are used for making bells. This is why we do not store Zinc sulphate solution in an aluminum vessel overnight. Gold is alloyed with copper to make it hard. 5. What do you mean by malleability and ductility? 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. Non-metals are generally (malleable/brittle). On exposure to air, they get oxidized. This is indicated by a colour change from blue to colourless. Ans: When aluminium reacts with oxygen or water, it forms aluminium oxide which gets deposited as a thin layer on aluminium and presents further oxidation. Mg + H2O ——>MgO + H2 (iii) Zinc reacts only with steam.Zn + H2O —> ZnO + H2 ↑. When zinc is placed In a solution of copper(II) sulfate, the zinc will replace the copper to become zinc sulfate and elemental copper. (a) Thermometers iron sulphate and zinc, Ans:(a) Copper sulphate and Zinc: A displacement reaction will occur between copper sulphate and zinc because zinc is placed above copper in the reactivity series. Ans: Musical instrument and bell are made up of metal because metal produce ringing sound when stuck by something. a. copper sulphate and zincb. The reaction between copper sulfate, CuSO_4(aq), and zinc, Zn(s) is an oxidation-reduction reaction in which zinc reduces the copper. NCERT Solutions Class 10 Science (Physics,Chemistry, Biology). sheets (metals) - can not be beaten into thin sheets -(non-metals) 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. Which of the following statements is true about the reaction between zinc and copper sulfate? True iii. ? ( )-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. Mark ‘T’ if the statement is true and ‘F’ if it is false. (iv) Carbon °C, if it absorbs 1.00 x 10 6 J of heat energy? After few days when zinc plate was taken out of the solution, a number of holes were observed on it. Some properties are listed in the following Table. ( ) Answer: 1. Zinc is more reactive than copper… Zn(s)+ CuSo 4( aq)→ ZnSo4(aq)+ Cu(s) (b) When an aluminum metal reacts with dilute HCl(Hydrochloric Acid) to for Aluminum Chloride(AlCl3) and Hydrogen(g) will be evolved in the reaction. It oxidises quickly and bums when exposed to air. Copper will precipitate, as it has very low solubility. Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. On dipping the gold jewellery in the acid solution, the outer layer of gold dissolves and the inner shiny layer appears. (a) When Zinc is added to the copper sulfate solution, then Zinc will displace copper from its position to form Zinc sulfate. 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. Ans: An alloy is a mixture of two or more metals or one or more metals and a non-metal. Sodium is a very reactive metal. 3. 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. ( ) (c) Copper displaces zinc from zinc sulphate solution. 4. Zinc is a chemical element with the symbol Zn and atomic number 30. Sodium is a very reactive metal. Mark ‘T’ if the statement is true and ‘F’ if it is false. Give reasons. What mass of ice, at 0.00 ° C, can be converted to steam, at 100. (ii) to extract metals such as copper, lead and tin. Could you store 500 ml Zinc sulphate solution in an aluminum vessel overnight? (vi) Mercury (d) One metal which will not displace copper from copper sulphate solution.Answer: Name one metal which will fit each of the following description. 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