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Q.

Consider the half-cell reduction reactionMn2++2e-→Mn,E°=-1.18 V Mn2+→Mn3++e-,E°=-1.51 V  The E° for the reaction 3Mn2+→Mn0+2Mn3+ ,and possibility of the forward reaction are respectively

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answer is 4.

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Detailed Solution

Mn2++2e-→Mn E°=-1.18 V 2Mn2+→2Mn3++2e- E°=-1.51 V  For the cell,  3Mn2+→Mn+2Mn3+ E°=-2.69 V  Since the E° value is negative,so the process is non-spantaneous
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Consider the half-cell reduction reactionMn2++2e-→Mn,E°=-1.18 V Mn2+→Mn3++e-,E°=-1.51 V  The E° for the reaction 3Mn2+→Mn0+2Mn3+ ,and possibility of the forward reaction are respectively