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Q.

Which one of the following element has the greatest  tendency to convert from +3 → +2 state in aqueous solution ?

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a

Co

b

Mn

c

Cr

d

Fe

answer is A.

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Detailed Solution

EM3+/M2+0values are negative for Ti, V, Cr and positive for Mn, Fe and Co.EM3+/M2+0value is most positive for cobalt  (1.97 V). Coblat has the greatest  tendency to convert from +3→+2 state in aqueous solution.
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Which one of the following element has the greatest  tendency to convert from +3 → +2 state in aqueous solution ?