Directions \( \quad \) In the following questions a statement of As...

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Directions \( \quad \) In the following
questions a statement of Assertion (A) followed by a
statement of Reason (R) is given. Choose the correct
answer out of the following choices.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of A.
(b) Both A and R are correct; \( \mathrm{R} \) is not the correct explanation of A.
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) R is correct; A is incorrect.
Assertion (A) \( \mathrm{Cr}^{2+} \) is reducing, while \( \mathrm{Mn}^{3+} \) is oxidising even both have \( d^{4} \) configuration.
Reason (R) Configuration of \( \mathrm{Cu} \) changes from \( d^{3} \) to \( d^{4} \).
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