Class 10 science ch1 Class 10 - CHEMICAL REACTION - Chemistry Mock Test. This Test Consist of 20 QuestionsTotal Time - 20 -Minutes 1. 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 A A, B Only D C, D None 2. When a magnesium ribbon is burnt in air, the ash formed is Yellow Black White Pink None 3. 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? The color disappears due to dilution, no reaction is involved 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 KMnO₄ is an oxidizing agent, it oxidizes FeSO₄ None 4. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation. The reaction mixture turns milky Odour of a pungent smelling gas is recorded A colorless and odourless gas is evolved The surface of metal becomes shining None 5. One of the following processes does not involve a chemical reaction, that is: Melting of candle wax when heated Digestion of food in your stomach Ripening of banana Burning of candle wax when heated None 6. 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 (iv) only (i) and (iii) (i) only (ii) and (iii) None 7. 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. C, A A, D D, B B, C None 8. Which of the given statements is not a physical change? Melting of ice to give water Dissolution of salt in water Combustion of Liquefied Petroleum Gas (LPG) Boiling of water to give water vapour None 9. 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 decomposition reaction as two compounds react to form a single compound. 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. None 10. 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 (i), (vi) and (iii) (ii) and (iv) (i), (ii) and (iv) None 11. 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) (i) and (iv) (ii) and (iii) None 12. 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 Cu Na Al Ca None 13. What happens when lead nitrate reacts with potassium iodide? Evolution of gas will occur Yellow ppt of lead iodide and potassium nitrate will be produced They will not react A large amount of hydrogen will be released None 14. 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) C, B A, B D, C D, B None 15. Which metallic spoon can be used to stir lead nitrate solution? Iron Sodium Silver Aluminium None 16. In writing chemical equations, inclusion of state symbols shall be done while Correct chemical formulae of reactants and products are written 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 None 17. Corrosion in case of iron is known as Rusting Combination Reduction Rancidity None 18. The reaction in which two compounds exchange their ions to form two new compounds is called Double displacement reaction Displacement reaction Combination reaction Redox reaction 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 unstable compound and de-composes in presence of FeSO4. to a colourless compound. KMnO4 is an oxidising agent, it oxidises FeSO4. FeSO4 acts as an oxidising agent and oxidises KMNO4. The colour disappears due to dilution; no reaction is involved. None 20. 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? Potassium sulphate Lead sulphate (insoluble) Ammonium nitrate Lead acetate 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.
