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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2010

  • question_answer
    For the reaction, \[N{{H}_{3}}+OC{{l}^{-}}\xrightarrow{{}}{{N}_{2}}{{H}_{4}}+C{{l}^{-}}\] occurring in basic medium, the coefficient of \[{{N}_{2}}{{H}_{4}}\]in the balanced equation will be

    A)  1               

    B)  2

    C)  3                

    D)  4

    Correct Answer: A

    Solution :

     The two half-reactions for the given reaction are \[2N{{H}_{3}}\xrightarrow[{}]{{}}{{N}_{2}}{{H}_{4}}+2{{H}^{+}}+2{{e}^{-}}\] \[OC{{l}^{-}}+2{{H}^{+}}+2{{e}^{-}}\xrightarrow[{}]{{}}C{{l}^{-}}+{{H}_{2}}O\] On adding both the reactions, we get \[2N{{H}_{3}}+OC{{l}^{-}}\xrightarrow[{}]{{}}{{N}_{2}}{{H}_{4}}+C{{l}^{-}}+{{H}_{2}}O\] The obtained equation is a balanced equation and in it, the coefficient of\[{{N}_{2}}{{H}_{4}}\]is 1.


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