Question

Assertion (A): Cuprous salts are diamagnetic.
Reason (R): Cuprous ion has completely filled 3d-orbitals.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Remember, diamagnetism occurs when all electrons are paired, regardless of the orbital configuration.

Answer 1

The Correct Option is C

Cuprous salts (Cu$^+$) are indeed diamagnetic because Cu$^+$ has a completely filled 3d orbital. However, the reason is incorrect: Cu$^+$ has only 10 electrons in its 3d orbital, but it is diamagnetic because there are no unpaired electrons. The explanation in Reason (R) does not fully justify the assertion.