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9th Class Science Structure of the Atom Question Bank Nature of Matter

  • question_answer
    When the same amount of zinc metal is treated separately with excess of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]and excess of\[\text{NaOH}\], the ratio of the volumes of \[{{\text{H}}_{\text{2}}}\]evolved is

    A)  1 : 1                                        

    B)  1 : 2

    C)  2:1                        

    D)         None of these

    Correct Answer: A

    Solution :

    \[Zn+{{H}_{2}}S{{O}_{4}}\to ZnS{{O}_{4}}+{{H}_{2}}\uparrow \]     \[Zn+2NaOH\to N{{a}_{2}}Zn{{O}_{2}}+{{H}_{2}}\uparrow \] Both the balanced equations show that from equal amount of zinc, both \[{{H}_{2}}S{{O}_{4}}\] and \[NaOH\] will liberate same amount of hydrogen.


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