Question

Assertion : `Cr^(2+)` is reducing and `Mn^(3+)` is oxidising.
Reason : `Cr^(2+)` and `Mn^(3+)` have `d^4` configuration.
A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true and reason not is the correct explanation of assertion.
C. If assertion is trun but reason is false.
D. If both assertion and reason are false.

Answer 1

Correct Answer - B
`Cr^(2+)` is reducing as its configuration changes from `d^4" to " d^3`(half-filled `t_(2g)`). The change from `Mn^(3+)` to `Mn^(2+)` results in the half -filled `d^5` configurations which has extra stability.