Question

Identify the set of paramagnetic ions among the following.

• A. \(\text{V}^{+2},\text{Co}^{+2},\text{Ti}^{+4}\)
• B. \(\text{Ni}^{+2},\text{Cu}^{+2},\text{Zn}^{+2}\)
• C. \(\text{Ti}^{+2},\text{Cu}^{+2},\text{Mn}^{+3}\)
• D. \(\text{Sc}^{+3},\text{Ti}^{+3},\text{V}^{+3}\)

Hint:

Paramagnetic ions have at least one unpaired d electron.

Answer 1

The Correct Option is C

Step 1: Write configurations
Ti\(^{2+}\): \(3d^2\) (2 unpaired). Cu\(^{2+}\): \(3d^9\) (1 unpaired). Mn\(^{3+}\): \(3d^4\) (4 unpaired).

Step 2: Check the other sets
(A) has Ti\(^{4+}\) (\(3d^0\)), which is diamagnetic.
(B) has Zn\(^{2+}\) (\(3d^{10}\)), which is diamagnetic.
(D) has Sc\(^{3+}\) (\(3d^0\)), which is diamagnetic.
Only (C) has all three paramagnetic.

Final Answer:
All ions in set (C) have unpaired electrons, option (C). \[ \boxed{\text{(C)}} \]