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CMC Medical CMC-Medical Ludhiana Solved Paper-2010

  • question_answer
    The coefficients of \[{{I}^{-}},\,IO_{3}^{-}\] and \[{{H}^{+}}\]in the redox reaction,\[{{I}^{-}}+IO_{3}^{-}+{{H}^{+}}\xrightarrow{{}}{{I}_{2}}+{{H}_{2}}O\]in the balanced form respectively are

    A)  5, 1, 6                                  

    B)  1, 5, 6

    C)  6, 1, 5                                  

    D)  5, 6, 1

    Correct Answer: A

    Solution :

                    \[{{I}^{-}}+\overset{+5}{\mathop{{{(I{{O}_{3}})}^{-}}}}\,+{{H}^{-}}\to \overset{0}{\mathop{{{I}_{2}}}}\,+{{H}_{2}}O\] \[2{{I}^{-}}\xrightarrow{{}}{{I}_{2}}+2{{e}^{-}}\]                ?(i) x 5 \[10{{e}^{-}}+\overset{+5}{\mathop{2{{(I{{O}_{3}})}^{-1}}}}\,\xrightarrow{{}}\overset{0}{\mathop{{{I}_{2}}}}\,\]                ?(ii) On adding Eqs. (i) and (ii), we get \[10{{I}^{-}}+2IO_{3}^{-}\xrightarrow{{}}6{{I}_{2}}\] To balance O atom, add \[6{{H}_{2}}O\]molecules/on RHS and \[12{{H}^{+}}\]on LHS, then \[10{{I}^{-}}+2IO_{3}^{-}+12{{H}^{+}}\xrightarrow{{}}6{{I}_{2}}+6{{H}_{2}}O\] or            \[5{{I}^{-}}+IO_{3}^{-}+6{{H}^{+}}\xrightarrow{{}}3{{I}_{2}}+3{{H}_{2}}O\]


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