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JEE Main & Advanced JEE Main Paper (Held On 19 April 2014)

  • question_answer
    Consider the reaction: \[{{H}_{2}}S{{O}_{3}}(aq)+S{{n}^{4+}}(aq)+{{H}_{2}}O(l)\] \[\to S{{n}^{2+}}(aq)+HSO_{4}^{-}(aq)+3{{H}^{+}}(aq)\] Which of the following statements is correct?     JEE Main Online Paper (Held On 19 April 2016)

    A) \[S{{n}^{4+}}\]is the oxidizing agent because it undergoes oxidation

    B) \[S{{n}^{4+}}\]is the reducing agent because it undergoes oxidation

    C) \[{{H}_{2}}S{{O}_{3}}\]is the reducing agent because it undergoes oxidation

    D) \[{{H}_{2}}S{{O}_{3}}\]is the reducing agent because it undergoes reduction

    Correct Answer: C

    Solution :

    \[{{H}_{2}}\overset{+4}{\mathop{S{{O}_{3}}}}\,\left( aq \right)+\overset{4+}{\mathop{S{{n}_{3}}}}\,\left( aq \right)+{{H}_{2}}O\left( l \right)\xrightarrow[{}]{{}}\] \[S{{n}^{2+}}\left( aq \right)+HSO_{4}^{-}\left( aq \right)+3{{H}^{+}}\] Hence \[{{H}_{2}}S{{O}_{3}}\]is the reducing agent because it undergoes oxidation.


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