Class 10 science ch1 Class 10 - CHEMICAL REACTION - Chemistry Mock Test. This Test Consist of 20 QuestionsTotal Time - 20 -Minutes 1. A dilute ferrous sulphate solution was gradu¬ally added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disap¬pears. Which of the following is the correct explanation for the observation? The colour disappears due to dilution; no reaction is involved. KMnO4 is an oxidising agent, it oxidises FeSO4. FeSO4 acts as an oxidising agent and oxidises KMNO4. KMnO4 is an unstable compound and de-composes in presence of FeSO4. to a colourless compound. None 2. Which of the following are exothermic processes?(a) Reaction of water with quick lime(b) Dilution of an acid(c) Evaporation of water(d) Sublimation of camphor (crystals) D, B D, C C, B A, B None 3. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation. The surface of metal becomes shining A colorless and odourless gas is evolved The reaction mixture turns milky Odour of a pungent smelling gas is recorded None 4. Which among the following statement(s) is (are) true?Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride(ii) sublimation of silver chloride(iii decomposition of chlorine gas from silver chloride(iv) oxidation of silver chloride (i) and (iii) (ii) and (iii) (i) only (iv) only None 5. Which of the following statements about the given reaction are correct? 3Fe(s) + 4H₂O(g) → Fe₃O₄ (s) + 4H₂ (g)(a) Iron metal is getting oxidized.(b) Water is getting reduced.(c) Water is acting as reducing agent.(d)Water is acting as oxidizing agent. A, b, c A, b, d A, c C, d None 6. In writing chemical equations, inclusion of state symbols shall be done while The chemical formulae of products and reactants have been changed to bring about quick balancing The equation is being balanced to fulfill the law of conservation of mass The equation has been balanced Correct chemical formulae of reactants and products are written None 7. Which of the following statements about the given reaction are correct?3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g)(i) Iron metal is getting oxidised(ii) Water is getting reduced(iii) Water is acting as reducing agent(iv) Water is acting as oxidising agent (ii) and (iv) (i), (vi) and (iii) (i), (ii) and (iv) None 8. Solid calcium Oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is are true about slaking of lime and the solution formed?(a) It is an endothermic reaction.(b) It is exothermic reaction.(c) The pH of the resulting solution will be more than seven.(d) The pH of the resulting solution will be less than seven. B, C C, A D, B A, D None 9. 2HNO3 + Ca (OH)2 → Ca (NO3)2 + 2H2O; is an example of(i) displacement reaction (ii) double displacement reaction (iii) neutralisation reaction (iv) combination reaction. (i) and (ii) (iii) and (iv) (ii) and (iii) (i) and (iv) None 10. The reaction in which two compounds exchange their ions to form two new compounds is called Redox reaction Displacement reaction Combination reaction Double displacement reaction None 11. One of the following processes does not involve a chemical reaction, that is: Digestion of food in your stomach Ripening of banana Melting of candle wax when heated Burning of candle wax when heated None 12. Which of the given statements is not a physical change? Melting of ice to give water Boiling of water to give water vapour Combustion of Liquefied Petroleum Gas (LPG) Dissolution of salt in water None 13. Which of the following shows an oxidation reaction? None of the above Loss of oxygen Gain of oxygen Gain of hydrogen None 14. When a magnesium ribbon is burnt in air, the ash formed is White Yellow Pink Black None 15. Corrosion in case of iron is known as Combination Rancidity Rusting Reduction None 16. A substance X which is a group 2 element is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Element X is Ca Al Na Cu None 17. What happens when lead nitrate reacts with potassium iodide? A large amount of hydrogen will be released They will not react Evolution of gas will occur Yellow ppt of lead iodide and potassium nitrate will be produced None 18. Which among the following statement(s) is /are true? Exposure of silver chloride to sunlight for a long duration turns grey due to-(a) The formation of silver by decomposition of silver chloride.(b) Sublimation of silver chloride.(c) Decomposition of chlorine gas from silver chloride.(d) Oxidation of silver chloride. A, B C, D Only A Only D None 19. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate? Lead acetate Potassium sulphate Lead sulphate (insoluble) Ammonium nitrate None 20. Which metallic spoon can be used to stir lead nitrate solution? Aluminium Iron Silver Sodium None Time's upTime is Up! 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