(b) FeSO4 acts as an oxidising agent and it oxidises KMnO4 Nonmetals lack lustre. Why do fire flies glow at night ? (c). (c) (ii) and (iii) Question 12. Answer: Question 16. Question 25. (e) 3Fe + 4H2O ———–> Fe3O4 + 4H2 Therefore, ionic compounds have high melting points. The molten aluminium is heavier than the electrolyte. Stainless steel: Stainless steel alloy is made from 74% iron, 18% chromium and 8% carbon. That is, will the following reaction occur? Draw and label the diagram of electrolysis of alumina and explain the electrolytic reduction of alumina. Also write the equation of the reaction. Sodium reacts with water. (i) the formation of silver by decomposition of silver chloride The homogeneous mixture formed by mixing a metal with other metals or nonmetals in certain proportion is called an alloy. Hydrogen gas is passed over boiling sulphur. (c) silver metal is added to copper sulphate solution ? (c) Carbon monoxide (CO) is the reducing agent. NCERT P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan. (c) 4:1 Sodium is a metal. (c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine. (d) Ethanol is burnt in air to form carbon dioxide, water and releases heat. Balance the following chemical equations and identify the type of chemical reaction. With dilute H2SO4 : Hydrogen gas evolves Distinguish between: (Two points of distinction). (d) (iii) and (iv) (d) (iii) and (iv) Common salt is solid and hard due to strong electrostatic attraction between oppositely charged Na+ and Cl- ions. Copper is reacted with dil. Aluminium is treated with dil. Which of the following correctly represents the type of the reaction involved ? A simple demonstration of a redox reaction involves placing a solid piece of copper wire in a silver nitrate solution. (b) aluminium metal is added to dilute hydrochloric acid ? Which among the following changes are exothermic or endothermic in nature ? (c) Copper displaces silver from the aqueous solution of silver nitrate. Therefore, these vessels are coated with tin to prevent corrosion. Answer: Answer: Hence, the ore can be concentrated. This element is present in bones also. Question 5. Question 15. Cathode: Al3+ + 3e– → Al(l). Answer: (a) 1:1 In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature ? Therefore, hydrogen catches fire accompanied by explosion. (e) Physical. (a) (i) and (iv) Answer: It is colourless. (d) One metal which will not displace copper from copper sulphate solution. (a) Silver metal does not show any change (c) O2 Metals and halogens are ranked according to their ability to displace other metals or halogens below them in the activity series. At this temperature, H2O formed is in gaseous state. Sodium metal is reacted chlorine gas. C u+2AgN O3 → C u(N O3 Answer: The match-stick will burn more brightly. As a result, a shiny coat of silver is formed on the coin. Extraction of mercury from its ore cinnabar and write the corresponding chemical reaction. The electrolysis of alumina is carried out at a low temperature by dissolving it in molten cryolite (Na3AlF6). When zinc carbonate is heated strongly in a limited supply of air, it gives zinc oxide and carbon dioxide. solution of silver nitrate (AgNO 3). The major problem of corrosion occurs with iron, as it is used as a structural material in construction, bridges, shipbuilding. Question 8. Question 6. (i) Pb + CuCl2 ————> PbCl2 + Cu When steam is passed over iron, iron (III) oxide and hydrogen gas are formed. It does not react with kerosene and sinks in it. Chlorine is treated with hydrobromic acid. (1) Bayer’s process is used to obtain pure aluminium oxide from bauxite. Hi, The copper being more reactive than silver will displace silver from its solution. (a) Endothermic Copper, being less reactive than silver, cannot displace silver from silver nitrate. Answer: (3) The gangue particles are wetted by water and settle down. Answer: In this reaction, carbon acts as reducing agent. Answer: If the number of electrons in the outermost orbit of an atom of a metal is less, the metal is more reactive. Question 8. (b) x = 2Ag(s) You are also provided with solutions of dilute HCl, dilute HNO3, ZnCl2 and water. The light purple colour of the solution fades and finally disappears. (b) SO2 Alloy decreases the intensity of corrosion of metals. A coating of silver sulphide (Ag2S) gets deposited on the surface of the metal. Copper is placed below hydrogen and therefore, does not react with dilute HCl. with dilute HCl : Hydrogen gas evolves Answer: (b) What other name can be given to this precipitation reaction ? Both helium (He) and nitrogen (N2) can be used. The article when rubbed with toothpaste again starts shining. Answer: Identify A’ and also write the chemical reactions involved. Silica reacts with sodium hydroxide to form soluble sodium silicate. Answer: Calcium reacts with water. Question 19. When aqueous solution of silver nitrate and sodium chloride are mixed, _____ precipitate is immediately formed. They undergo fermentation under aerobic conditions (in the absence of air or oxygen). In the extraction of aluminium: Therefore, it sinks to the bottom of the electrolyte and is removed from time to time. (a) (i) and (ii) Cuprous sulphide is heated in air. Answer: On treatment with water it forms a solution which turns red litmus blue. (c) Keeping petrol in a china dish in the open Explain its reaction with oxygen. hydrochloric acid, aluminium chloride and hydrogen gas are formed. (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas. (b) The reaction of aluminium (Al) with dilute HCl is of exothermic nature. (d) Hydrogen gas : The gas itself is combustible. (b) H2(g) + O2(l) ———>2H2O(l) Lead sulphate being insoluble in water will not react. Answer: Beams of scientific balances, aircraft parts. \[Cu_{(s)} + AgNO_{3 (aq)} → Summary. When magnesium reacts with dil. (c) Ammonium nitrate Sulphur burns in air. Answer: hydrochloric acid. Nonmetals are bad conductors of heat and electricity. The property due to which a substance can be drawn into a thin wire without cracking or breaking is called ductility. MCQs For Chemical Reactions and Equations Part-III. Oxygen has displaced hydrogen from NH3. (a). When copper is mixed in silver nitrate solution, it displaces the silver because copper is more reactive than silver. Answer: (iii) Evaporation of water (a) zinc metal is added to copper sulphate solution ? They have high melting and boiling points, due to intermolecular force of attraction is high in ionic compounds. Here we have given NCERT Exemplar Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations, NCERT Exemplar Solutions for Class 10 Science Chapter 1 Multiple Choice Questions. nitric acid. Answer: Sodium aluminate is treated with water. As a result, fire flies glow at night. Question 36. Ammonia (NH3) is the reducing agent. (a) Carbon dioxide or oxygen 2H2 (g) + O2 (g) ———-> 2H2O (g), Question 41. Alloys are corrosion resistant. This oxide layer is strong and uniform all over the surface. The crude zinc carbonate ore is heated strongly in limited supply of air. It therefore, displaces hydrogen from dilute HCl. (b) (i) and (iii) Question 10. (b) (ii) and (iii) Common salt is an ionic compound. Question 8. nitric acid, copper nitrate and nitric oxide are formed. Sodium reacts with oxygen in air at room temperature to form sodium oxide. (c) CuSO4 + Zn ———-> Cu + ZnSO4 Answer: Question 6. (i) Name the process of concentration of bauxite. This result in precipitation of aluminium hydroxide. However, we cannot keep steam since a chemical reaction is likely to take place. ————> ZnSO4 (aq) + H2(g) Interestingly, it was previously known as lunar caustic by ancient alchemists who associated silver with the moon. Question 44. (c) It is a decomposition reaction and is accompanied by release of heat (a) (i) and (iv) (1) Corrosion of a metal can be prevented if the contact between metal and air is cut off. (iii) C + O2  ———–> CO2 It has reduced ferric oxide (Fe2O3) which acts as oxidising agent. (b) Dilution of sulphuric acid Which of the following is the correct explanation for the observation ? Pb NO aq … Hence, to protect sodium and to prevent accidental fires it is always kept in kerosene. At anode: Ag → Ag+ + e– Question 42. Common salt has high melting and boiling points. Which of the following statements about the given reaction are correct ? (1) Which process will you study with the help of above material and solutions. Answer: Copper loses its lustre due to formation of greenish layer of copper carbonate (CuCO. The process in which a metal is destroyed gradually by the action of air, moisture or a chemical (like an acid) on its surface is called corrosion. Calcium oxide (CaO) reacts with water to form calcium hydroxide (basic in nature). Both the reactions (ii) and (iii) are the examples of combination reactions. (a) (i) only (ii) It is an exothermic reaction Answer: Potassium permanganate (KMnO4) is an oxidising agent. Answer: This process is called slaking of lime. Solutions to be kept in copper container : Solutions to be kept in aluminium container: Hope given NCERT Exemplar Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations are helpful to complete your science homework. (b) (iii) and (iv) b. Silver nitrate is highly soluble in water and other solvents. When cinnabar is heated in air, it forms mercuric oxide and sulphur dioxide. It melts at a comparatively low temperature and can therefore conveniently fill in the cavities. (a) x = yellow precipitate, y = (aq) Which of the following are exothermic processes ? In Hall’s process the ore is powdered and then it is leached by heating with aqueous sodium carbonate in the digester to form water soluble sodium aluminate. ———–> ZnCl2(aq) + H2(g) Cooking vessels made of copper and brass get a greenish coating due to corrosion. 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(b) (ii) and (iii) Answer: In this reaction, the heat evolved is not sufficient for hydrogen to catch fire. (i) Reaction of quick lime with ; water and (ii) dilution of an acid are both exothermic processes. (a) white (b) yellow (c) red (d) black. Question 38. (5) Molten aluminium is collected at the cathode, while oxygen gas is evolved at the anode. Answer: Question 7. In case a reaction takes place, support it by a chemical equation. It is also less sensitive to light than its silver halide relatives, and is made by dissolving large amounts of silver in nitric acid. Examples: Silver-plated spoon, gold-plated jewellery. Jason Rothman, Chemist - Pomona, California, USA. When cuprous sulphide is heated in air, cuprous oxide is formed. (d) 1:2. Answer: Write the balanced chemical equations for the following reactions and identify the type of reaction in each case. (b). The chemical reaction is an example of thermal decomposition reaction. (Practice Activity Sheet – 3) (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water. When zinc granules are added to copper sulphate solution, they displace copper from the copper sulphate solution to form zinc sulphate solution. Answer: (d) Dissolution of ammonium chloride in water The oxygen gas liberated reacts with carbon anode and forms carbon dioxide.

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