(a) Generally, non-metals react with acids. Thus, it will not replace iron from iron sulphate. (a) Thermometers. Which of the above metals is stored in kerosene ? Name one metal which will fit each of the following description. This reaction takes place in an aqueous solution. It can dissolve gold, even though neither of these acids can do so alone. Answer: Copper is less reactive than zinc. °C, if it absorbs 1.00 x 10 6 J of heat energy? (d) Some non-metals are ductile. 1. Assertion : Zinc displaces copper from copper sulphate solution. ( ) (d) Coal can be drawn into wires. Thus, it will replace copper.Fe + CuSO4 —> FeSO4 + Cu. (a) Dilute sulphuric acid is poured on a copper plate? Which among the following aljoys contain non-metal as one of its constituents? Ans: (a) It is widely used to make electric wires and cables. Zinc is a chemical element with the symbol Zn and atomic number 30. Applying grease or oil on the surface has a similar effect. So aluminium is more reactive than zinc. What happen as a result of the reaction, Answer: Carbon is a non metal.
Statement-2: The of Zn is -0.76 volts and that of Cu is +0.34 volts. Conduction of electrical - good conductor ( metals) - bad conductor (non metals), Q.6 Give reasons for the following. B The metals copper, silver gold and … (F) (iv) Coal can be drawn into wires. Would it still have been such a useful metal .Give reason? In this reaction, the blue colour of copper sulphate fades and there is a deposition of copper on the iron nail. 4. NCERT Solutions Class 10 Science (Physics,Chemistry, Biology). . If a galvanic cell is prepared correctly, what would the initial multimeter reading be? 3. An alloy is usually made by mixing together metals in their molten form. Sulphur is the main constituent of skin ointments. 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). Then drop in the nail. Copper displaces zinc from zinc sulphate solution. Cu + H2SO4 (conc.) (c) Wrapping food Question 71. What do you mean by malleability and ductility? Answer: (a) False (b) True (c) False (d) False. gold, silver. Discuss briefly the different methods used for preventing corrosion of metals. (f) Fuel, A (a) Phosphorus is a very _________non-metal. 4. ( ) Answer: 1. Why is graphite not used for making electric cable? Her mother gave old gold jewellery to the goldsmith to polish. The blue color of the aqueous copper (II) sulfate solution is due to the presence of the hexaaquacopper (II) ion in water. 4. (i) Sodium reacts vigorously with water, giving off a lot of heat. (False) (iv) Copper displaces zinc from zinc sulphate solutions. (b) Sodium is a very reactive metal. zinc is more reactive than copper hence it displaces the copper in copper sulphate solution to become zinc sulphate and copper metal is formed (a) Generally, non-metals react with acids. Appearance a. copper sulphate and zincb. What is the advantage of galvanized iron over tin-plated iron? On dipping the gold jewellery in the acid solution, the outer layer of gold dissolves and the inner shiny layer appears. Answer (a) True (b) False (c) False Which metal is displaced during this reaction? A student dips a zinc plate in copper sulphate solution. Which of the following statements is true about the reaction between zinc and copper sulfate? How are these properties different in metals and non-metals? ... Copper displaces zinc from zinc sulphate solution. ( ) (c) Copper displaces zinc from zinc sulphate solution. 5. This is indicated by colour change from blue to colourless. Examples: gold, silver, platinum. ( ) Solution: (A) False . Iron is used in construction of bridges and houses. The activity shows that for rusting to take place, both air (oxygen) and water are essential. A zinc electrode and a copper electrode are placed in a beaker containing an aqueous solution of zinc sulfate, ammonium citrate, and ammonium chloride. 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. (B) True . This process is called galvanization. ( )-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. d) Sodium and Potassium are highly reactive metals which readily reacts with atmospheric Oxygen to catch fire hence Sodium and Potassium are stored in kerosene. (a) Generally, non-metals react with acids. Making foil for wrapping food: – Aluminium5. (i) Gold (c) Copper displaces zinc from zinc sulphate solution. (b) Metals are good conductors of heat and __electricity__. Most reactive metal is K and least reactive metal is Au. 6. (a) Zinc is more reactive than Copper Sol. ( ) True (c) Copper displaces zinc from zinc sulphate solution. Generally Non-metallic oxides are acidic in nature and acids react with bases. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is not correct explanation of A (c) A is true but R is false 1. (Iodine/bromine) has antiseptic properties. Your email address will not be published. [ ] (d) Coal can be drawn into wires. True or False and correct the incorrect statements. 2. Copper is used in electrical wiring because it is a good conductor of electricity. It is used in the manufacture of sulphuric acid. Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. 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. 5. 2. Boil it for one minute to remove any dissolved air. Some properties are listed in the following Table. Which of the metals become black in the presence of hydrogen sulphide ? What is an alloy? State whether the following statement is true or false: ... Zinc displaces copper from copper sulphate solution and mercury does not displaces copper from copper sulphate solution. Explain. Under what conditions was the maximum amount of precipitate formed when the copper sulfate was added to the zinc sulfide? (ii) to extract metals such as copper, lead and tin. Mark ‘T’ if the statement is true and ‘F’ if it is false. (iii) Metals react with dilute acid, like dilute HCl to give a metal salt and H2 gas.2Na + 2HCl → 2NaCl + H2Hydrogen gas is not evolved when a metal reacts with nitric acid (HNO3) . ( ) (c) Copper displaces zinc from zinc sulphate solution. Generally, non-metals react with acids. Name a non metal which When red hot reacts with steam. (c) Copper cannot displace zinc from its salt solution. Ans: Silverware becomes black faster today than it did fifty years ago because of air pollution. All reactants and … This is indicated by a colour change from blue to colourless. 4. Coal can be drawn into wires. True . Since Zinc is more reactive than Copper, Zinc displaces Copper from Copper sulphate to form Zinc sulphate and Copper. Mark ‘T’ if the statement is true and ‘F’ if it is false. Statement-1: Zinc displaces copper from copper sulphate solution. copper is lower in the electrochemical series than zinc. Explanation - Zinc is more reactive than copper. (a) Generally, non-metals react with acids. All metals exist in solid form at room temperature. 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. [KVS 2005]. Ans: Yes. read more Aluminium is a highly malleable metal and can be made into foils. (a) How will she find the nature of the gas? ( ) (b) Sodium is a very reactive metal. ii) Iron being more reactive displaces copper from copper sulphate. (iii) in oxy-hydrogen flame for cutting and welding metals. 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. Making electric wire: – copper and aluminium 4. This reaction forms a gaseous mixture of carbon monoxide and hydrogen, called water gas. Copper can effectively help to prevent the spread of respiratory viruses, which are linked to severe acute respiratory syndrome (SARS) and Middle … ( ) Open in new tab link Put a layer of cotton over salt and then put the nail. Which gas will be liberated when metals react with cold water ? (c) Copper displaces zinc from zinc sulphate solution. Mark ‘T’ if the statement is true and ‘F’ if it is false. 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. (e) Copper displaces zinc from a zinc sulfate solution. (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. This reaction shows that zinc is more reactive than copper as it displaces copper from its solution and zinc passes into solution as zinc ions and zinc sulphate solution is formed. Question 14.State whether the following statements are True or False : 1. Thus, it will not replace zinc. After shaking, test the solution with blue litmus. Aluminium protects itself against corrosion. As a result zinc sulphate is formed. (d) Metals react with acids to produce __hydrogen__ gas. They are also sometimes made by mixing metal powders together. Is the solution acidic or basic? 1. ( ), Copper displaces zinc from zinc sulphate solution. We can’t use pure gold to make jewellery. False iv. Could you store 500 ml Zinc sulphate solution in an aluminum vessel overnight? (b) Immersion rods for heating liquids are made up of metallic substances. 1. Iron sheets are galvanised before use so that they do not corrode. Explain. Zinc can displace copper from copper sulphate solution and iron from ferrous sulphate solution. False… Ans: .Bells are made of metals and not from wood because metals are sonorous but wood is not. Ans: Metals react with water to form oxides or hydroxides and hydrogen. They do not losetheir shine easily. (d) Coal can be drawn into wires. Give three examples of reactions between metals and water, to show that different metals have different relativities. The metals mostly used are tin and zinc. The chemical reaction for the reaction between concentrated sulfuric acid and copper is: (c) Iron is __more__ reactive than copper. Zinc is oxidized, and copper ion is reduced. (g) Non-metals react with water to form a gas which burns with a ‘pop’ sound. Ans: (a) False (b) True (c) False (d) False (a) All metals are ductile. Give reason: Chemical reaction does not take place when copper is added to iron sulphate solution. The metallic oxide formed would be acidic or basic in nature ? 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