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Question

For M2+/M and M3+/M2+ systems the E values for some metals are as follows:

Cr2+/Cr 0.9 V Cr3+/Cr2+ 0.4 V
Mn2+/Mn 1.2 V Mn3+/Mn2+ +1.5 V
Fe2+/Fe 0.4 V Fe3+/Fe2+ +0.8 V
Choose the correct statements:

A
Cr3+ can be reduced to Cr2+ easily
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B
Mn3+ can be reduced to Mn2+ easily
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C
Fe3+ is more stable than Mn3+
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D
Fe3+ is less stable than Cr3+
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Solution

The correct option is D Fe3+ is less stable than Cr3+
(a) Cr3+/Cr2+ has negative potential. Hence, Cr3+ cannot be reduced to Cr2+.
(b) Mn3+/Mn2+ has a large positive reduction potential. Hence, Mn3+ can be easily reduced to Mn2+.
(c) and (d) Fe3+/Fe2+ has small positive reduction potential. Hence, Fe3+ is more stable than Mn3+ but less stable than Cr3+.

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