Question:
Assertion (A): Cuprous salts are diamagnetic.
Reason (R): Cuprous ion has completely filled 3d-orbitals.
Assertion (A): Cuprous salts are diamagnetic.
Reason (R): Cuprous ion has completely filled 3d-orbitals.
Reason (R): Cuprous ion has completely filled 3d-orbitals.
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Remember, diamagnetism occurs when all electrons are paired, regardless of the orbital configuration.
Updated On: Jan 14, 2026
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Assertion (A) is false, but Reason (R) is true.
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The Correct Option is C
Solution and Explanation
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.
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