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10th Class Science Chemical Reactions and Equations Question Bank Chemical Reactions and Equations

  • question_answer
    Study the given table carefully.
    S. No. Metal Reaction with dilute HCI
    1. P No change
    2. Q Temperature of reaction mixture rises.
    3. R Reaction is explosive.
    4. S Some gas bubbles are seen.
    Metals P, Q, R and S could be respectively

    A) K, Al, Na and Cu

    B) Cu, Pb, Na and Al

    C) Ag, Al, Na and Pb

    D) Cu, Ca, K and AI

    Correct Answer: C

    Solution :

    Silver cannot displace hydrogen from dilute acid. The reaction of aluminium with hydrochloric acid is exothermic. Sodium is highly reactive so, reaction is explosive. Lead is slightly more reactive than hydrogen hence, only some gas bubbles are seen.


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