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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Critical Thinking Electrochemistry

  • question_answer
    The number of electrons to balance the following equation \[NO_{3}^{-}+4{{H}^{+}}+{{e}^{-}}\,\to \,2{{H}_{2}}O+NO\] is    [IIT Screening 1991]

    A)                 5             

    B)                 4

    C)                 3             

    D)                 2

    Correct Answer: C

    Solution :

                    \[NO_{3}^{-}+4{{H}^{+}}+4{{e}^{-}}\to 2{{H}_{2}}O+NO.\] In this equation all the atoms are balanced. For balancing added \[3{{e}^{-}}\] to \[L.H.S.\] we have,  \[NO_{3}^{-}+4{{H}^{+}}+3{{e}^{-}}\to 2{{H}_{2}}O+NO\].


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