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State the reason for the following : (...

State the reason for the following :
(i) Cu (I) ion is not stable in an aqueous solution.
(ii) Unlike `Cr^(3+),Mn^(2+),Fe^(3+)` and the subsequent other `M^(2+)` ions of the 3d series, the 4d and 5d series metals generally do not form stable oxidation states.

Text Solution

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(ii) `Cr^(2+)` is stronger reducing agent than `Fe^(2+)`
Reason : `d^(4) to d^(3)` occurs in case of `Cr^(2+) ` to `Cr^(3+)`
But `d^(6) to d^(5)` occurs in case of `Fe^(2+)` to `Fe^(3+)`
In a medium (like water) `d^(3)` is more stable as compared to `d^(5)`.
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