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10th Class Science Metals and Non-metals / धातु और अधातु Question Bank Metals and Non-metals

  • question_answer
    Observe the rate of evolution of hydrogen gas with five metals P, Q, R, S and T at room temperature. What could be the metals P, Q, R, S and T?

    A)
    P Q R S T
    Zn Al Mg Cu Fe
                   

    B)
    P Q R S T
    Mg Al Zn Fe Cu

    C)
    P Q R S T
    Al Zn Mg Fe Cu
                   

    D)
    P Q R S T
    Fe Zn Mg Al Cu

    Correct Answer: B

    Solution :

              In reactivity series, the order of reactivity of given metals is as follows: Mg > Al > Zn > Fe > Cu Thus, rate of evolution of Hz gas in case of Mg is maximum followed by Al, Zn and then Fe. Cu does not react with dil. \[HCl,\] so no evolution of \[{{H}_{2}}\]gas is observed.


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