MCQ
Oxidation and reduction take place in a cell, then its electromotive force will be
- ✓Positive
- BNegative
- CZero
- DStable
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$CH_3-CH=CH-CH_2-C\equiv CH$

$Mn^{2+} +2e- \rightarrow Mn;\, E^o = -1.18\,V$
$2(Mn^{3+} +e^- \rightarrow Mn^{2+} )\,;\,E^o=+1.51\,V$
The $E^o$ for $3Mn^{2+} \rightarrow Mn+ 2Mn^{3+}$ will be :