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Q.

Consider the behaviour of Cr and Mn in aqueous solution. Regarding these two elements, correct statement is

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a

Both have a tendency to show a change in oxidation state from ‘+3’ to ‘+2’

b

Both have a tendency to show a change in oxidation state from ‘+2’ to ‘+3’

c

‘Cr’ has a tendency to show a change in oxidation state from ‘+3’ to ‘+2’ whereas ‘Mn’ has a tendency to show a change in oxidation state from ‘+2’ to ‘+3’

d

‘Mn’ has a tendency to show a change in oxidation state from ‘+3’ to ‘+2’ whereas ‘Cr’ has a tendency to show a change in oxidation state from ‘+2’ to ‘+3’

answer is D.

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Detailed Solution

$E_{{Mn}^{+ 3} / {Mn}^{+ 2}}^{0} = + 1.57 V; + 3 to + 2 . . . . is feasible; E_{{Cr}^{+ 3} / {Cr}^{+ 2}}^{0} = - 0.41 V; + 2 to + 3 . . . . is feasible;$

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