JEE Main & Advanced Chemistry Hydrogen & Its Compounds Question Bank Hydrogen

  • question_answer Hydrogen is not obtained when zinc reacts with [J & K 2005]

    A) Cold water

    B) Hot \[NaOH\] solution

    C) Conc. sulphuric acid

    D) dilute \[HCl\]

    Correct Answer: C

    Solution :

    \[Zn+{{H}_{2}}O\to ZnO+{{H}_{2}}\] \[Zn+2NaOH\to N{{a}_{2}}Zn{{O}_{2}}+{{H}_{2}}\] \[Zn+2HCl\to ZnC{{l}_{2}}+{{H}_{2}}\] \[Zn+2{{H}_{2}}S{{O}_{4}}\to ZnS{{O}_{4}}+S{{O}_{2}}+2{{H}_{2}}O\].

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