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. A, B Only A C, D Only D None 2. 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 3. One of the following processes does not involve a chemical reaction, that is: Burning of candle wax when heated Melting of candle wax when heated Ripening of banana Digestion of food in your stomach 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 A colorless and odourless gas is evolved The surface of metal becomes shining Odour of a pungent smelling gas is recorded None 5. 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) (i) only (ii) and (iii) (iv) only None 6. 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 7. Which of the following shows an oxidation reaction? Gain of hydrogen Gain of oxygen None of the above Loss of oxygen None 8. Which of the given statements is not a physical change? Dissolution of salt in water Boiling of water to give water vapour Combustion of Liquefied Petroleum Gas (LPG) Melting of ice to give water 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? FeSO₄ acts as an oxidizing agent and oxidizes KMnO₄ The color disappears due to dilution, no reaction is involved KMnO₄ is an oxidizing agent, it oxidizes FeSO₄ KMnO₄ is an unstable compound and decomposes in the presence of FeSO₄ to a colourless compound None 10. When a magnesium ribbon is burnt in air, the ash formed is Yellow Black Pink White None 11. 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? 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. KMnO4 is an oxidising agent, it oxidises FeSO4. None 12. The reaction in which two compounds exchange their ions to form two new compounds is called Redox reaction Combination reaction Double displacement reaction Displacement reaction None 13. 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 Ammonium nitrate Lead sulphate (insoluble) Potassium sulphate 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 D, C A, B D, B None 15. What happens when lead nitrate reacts with potassium iodide? They will not react A large amount of hydrogen will be released Yellow ppt of lead iodide and potassium nitrate will be produced Evolution of gas will occur None 16. 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, d A, b, c A, c C, d None 17. Which metallic spoon can be used to stir lead nitrate solution? Aluminium Iron Silver Sodium 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 decomposition reaction as two compounds react to form a single compound. 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. None 19. Corrosion in case of iron is known as Reduction Combination Rancidity Rusting None 20. 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 (iv) (ii) and (iii) (iii) and (iv) (i) and (ii) 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.
