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JEE Main & Advanced Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Compounds of Transitional Elements

  • question_answer
    Which of the following metal gives hydrogen gas, when heated with hot concentrated alkali [Pb. CET 2002]

    A) Cu

    B) Ag

    C) Zn

    D) Ni

    Correct Answer: C

    Solution :

    \[Zn+\underset{\text{Conc}\text{.}}{\mathop{NaOH}}\,\to \underset{\text{Sodium zincate}}{\mathop{N{{a}_{2}}Zn{{O}_{2}}}}\,+\underset{\text{Hydrogen}}{\mathop{{{H}_{2}}}}\,\] Thus in this reaction hydrogen gas is produced when zinc is treated with concentrated NaOH.


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