MCQ
The correct order of basicity for the following molecules is :


- AP $>$ Q $>$ R
- BR $>$ P $>$ Q
- CQ $>$ P $>$ R
- ✓R $>$ Q $>$ P


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$A \,|\, A^+\, (xM)\, ||\, B^+ \,(yM)\, |\, B$
The $emf$ measured is $+ 0.20\, V.$ The cell reaction is