A) \[{{A}^{+}}+B\xrightarrow{{}}A+{{B}^{+}}\]
B) \[{{A}^{+}}+{{e}^{-}}\xrightarrow{{}}A;\,{{B}^{+}}+{{e}^{-}}\to B\]
C) the cell reaction cannot be predicted
D) \[A+{{B}^{+}}\xrightarrow{{}}{{A}^{+}}+B\]
Correct Answer: D
Solution :
Electrochemical cell \[A\,|{{A}^{+}}\,(xM)\,|\,|{{B}^{+}}(yM)|\,B\] The emf of cell is + 0.20 V. So cell reaction is possible. The half cell reaction are given as follows: (i) At negative pole: \[A\xrightarrow[{}]{{}}{{A}^{+}}+{{e}^{-}}(oxidation)\] (ii) At positive pole: \[{{B}^{+}}+{{e}^{-}}\xrightarrow[{}]{{}}B(reduction)\] Hence, cell reaction is \[A+{{B}^{+}}\to {{A}^{+}}+{{B}^{-}},\,E_{cell}^{o}=+0.20\,V\]
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