CMC Medical CMC-Medical Ludhiana Solved Paper-2008

  • question_answer
    Which of the, following acts as an oxidising as well as reducing agent?

    A)  \[N{{a}_{2}}O\]                               

    B)  \[N{{a}_{2}}{{O}_{2}}\]

    C)  \[NaN{{O}_{3}}\]                           

    D)  \[NaN{{O}_{2}}\]

    Correct Answer: B

    Solution :

                    \[NaN{{O}_{2}}\](sodium nitrite) acts both as an oxidising as well as reducing agent because in it N-atom is in +3 oxidation state (intermediate oxidation state). Oxidising property \[2NaN{{O}_{2}}+2KI+2{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}N{{a}_{2}}S{{O}_{4}}\] \[+{{K}_{2}}S{{O}_{4}}+2NO+2{{H}_{2}}O+{{I}_{2}}\] Reducing property \[{{H}_{2}}S{{O}_{2}}+NaN{{O}_{2}}\xrightarrow{{}}NaN{{O}_{3}}+{{H}_{2}}O\]


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