| A hypothetical electrochemical cell is shown below \[A|{{A}^{+}}(xM)||{{B}^{+}}(yM)|B\]. |
| The emf measured is + 0.20 V. The cell reaction is: [AIPMT (S) 2006] |
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 :
| [d] 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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