COMEDK · Chemistry · 23. d and f Block Elements

Which of the following does not correctly represent the order of the property indicated against it?

A \(\text{Ti}^{3+} < \text{V}^{3+} < \text{Cr}^{3+} < \text{Mn}^{3+}\) [Increasing order of magnetic moment]
B \(\text{Ti} < \text{V} < \text{Cr} < \text{Mn}\) [Increasing order of highest oxidation state]
C \(\text{Ti} < \text{V} < \text{Cr} < \text{Mn}\) [Increasing order of melting point]
D \(\text{Ti} < \text{V} < \text{Mn} < \text{Cr}\) [Increasing order of second ionisation enthalpy]

Verified Solution

Answer & Solution

Correct Answer

(C) \(\text{Ti} < \text{V} < \text{Cr} < \text{Mn}\) [Increasing order of melting point]

Step-by-step Solution

Detailed explanation

The magnetic moment depends on the number of unpaired electrons. The electronic configurations of the given ions are \(\text{Ti}^{3+}\) (\(3d^{1}\)), \(\text{V}^{3+}\) (\(3d^{2}\)), \(\text{Cr}^{3+}\) (\(3d^{3}\)), and \(\text{Mn}^{3+}\) (\(3d^{4}\)). The number of unpaired…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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