Chemical Reactions and Equations

Subject matter experts of JagranJosh have developed chapter wise practice questions as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Chemical Reactions and Equations” of Science.

  • Q1.Which of the statements about the reaction below are incorrect?
    2PbO( s ) + C( s )  2Pb( s ) + C O 2 ( g ) 
    i. Lead is getting reduced.
    ii. Carbon dioxide is getting oxidized.
    iii. Carbon is getting oxidized.
    iv. Lead oxide is getting reduced.→

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  • Q2.Which of the following is not a balanced equation?

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  • Q3.Aluminum reacts with copper sulphate to produce

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  • Q4.What happens when dilute HCl is added to iron filings? Tick the correct answer.

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  • Q5.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?
    i. It is an endothermic reaction
    ii. It is an exothermic reaction
    iii. The pH of the resulting solution will be more than seven
    iv. The pH of the resulting solution will be less than seven

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  • Q6.Which among the following are endothermic processes?
    i. Reaction of quick lime with water
    ii. Dilution acid with water
    iii. Evaporation of water
    iv. Sublimation of solid ammonium chloride

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  • Q7.Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involve?
    i. Displacement reaction
    ii. Precipitation reaction
    iii. Combination reaction
    iv. Double displacement reaction

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