1.

Assertion (A): Cr and Cu having [Ar] 3d^(5)4s^(1) and [Ar] 3d^(10) 4s^(1) are more stable. Reason (R): The extra stability of elements Cr and Cu is due to symmetrical distribution of electrons and exchange energy.

Answer»

Both (A) and (R) are CORRECT and (R) EXPLAINS (A)
Both (A) and (R) are correct but (R) is not the correct EXPLANATION of (A).
(A) is correct but (R) is WRONG
(A) is wrong but (R) is correct.

Solution :Both (A) and (R) are correct and (R) explains (A)


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