Class 10 science ch1 Class 10 - CHEMICAL REACTION - Chemistry Mock Test. This Test Consist of 20 QuestionsTotal Time - 20 -Minutes 1. What happens when lead nitrate reacts with potassium iodide? Yellow ppt of lead iodide and potassium nitrate will be produced Evolution of gas will occur A large amount of hydrogen will be released They will not react None 2. Which metallic spoon can be used to stir lead nitrate solution? Silver Aluminium Iron Sodium None 3. 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. Only D C, D Only A A, B None 4. 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 5. 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 6. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation. A colorless and odourless gas is evolved The reaction mixture turns milky The surface of metal becomes shining Odour of a pungent smelling gas is recorded None 7. 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 Al Cu Na Ca None 8. Which of the given statements is not a physical change? Combustion of Liquefied Petroleum Gas (LPG) Melting of ice to give water Dissolution of salt in water Boiling of water to give water vapour None 9. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple color of the solution fades and finally disappears. Which of the given equation is the correct explanation for the observation? KMnO₄ is an oxidizing agent, it oxidizes FeSO₄ FeSO₄ acts as an oxidizing agent and oxidizes KMnO₄ KMnO₄ is an unstable compound and decomposes in the presence of FeSO₄ to a colourless compound The color disappears due to dilution, no reaction is involved None 10. Corrosion in case of iron is known as Combination Rusting Rancidity Reduction None 11. The reaction in which two compounds exchange their ions to form two new compounds is called Double displacement reaction Combination reaction Redox reaction Displacement reaction None 12. 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. D, B A, D B, C C, A None 13. 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. (ii) and (iii) (i) and (ii) (iii) and (iv) (i) and (iv) None 14. 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 C, d A, b, d A, c None 15. 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 sulphate (insoluble) Lead acetate Ammonium nitrate Potassium sulphate None 16. Which of the following shows an oxidation reaction? Loss of oxygen Gain of oxygen Gain of hydrogen None of the above None 17. When a magnesium ribbon is burnt in air, the ash formed is White Yellow Black Pink None 18. A student wrote a chemical equation of the reaction between carbon monoxide and hydrogen as, CO2 + 2H2 → CH3OH. How can the reaction be classified? The reaction is an example of a combination reaction as two compounds react to form a single compound.1 The reaction is an example of a combination reaction as a compound separates into two compounds. The reaction is an example of a decomposition reaction as a compound dissociates into two compounds. The reaction is an example of a decomposition reaction as two compounds react to form a single compound. None 19. 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? 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. The colour disappears due to dilution; no reaction is involved. None 20. One of the following processes does not involve a chemical reaction, that is: Ripening of banana Melting of candle wax when heated Burning of candle wax when heated Digestion of food in your stomach None Time's upTime is Up! Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
