NEET Sample Paper NEET Sample Test Paper-39

  • question_answer A hypothetical electrochemical cell is shown below\[\overset{O-}{\mathop{A}}\,|{{A}^{+}}(xM)||{{B}^{+}}(yM)|\overset{O-}{\mathop{B}}\,\]The emf measured is + 0.20 V. The cell reaction is

    A)  The cell reaction cannot be predicted

    B) \[A+{{B}^{+}}\xrightarrow{{}}{{A}^{+}}+B\]

    C) \[{{A}^{+}}+B\xrightarrow{{}}A+{{B}^{+}}\]

    D) \[{{A}^{+}}+{{e}^{-}}\xrightarrow{{}}A;{{B}^{+}}+{{e}^{-}}\xrightarrow{{}}B\] 

    Correct Answer: B

    Solution :

     \[{{E}_{cell}}=+ve\] thus redox changes are \[A\xrightarrow{{}}{{A}^{+}}+{{e}^{-}}\,LHS\]shows oxidation. \[{{B}^{+}}+e\xrightarrow{{}}B\,RHS\]shows reduction \[A+{{B}^{+}}\xrightarrow{{}}{{A}^{+}}+B\]

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