TS EAMCET · Chemistry · d and f Block Elements

Among the following series of transition metal ions, the one in which all the metal ions have \(3 d^2, 3 p^6\) electronic configuration is (Atomic number, \(\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Cr}=24\), \(\mathrm{Mn}=25\) )

A \(\mathrm{Ti}^{3+}, \mathrm{V}^{2+}, \mathrm{Cr}^{3+}\) and \(\mathrm{Mn}^{4+}\)
B \(\mathrm{Ti}^{+}, \mathrm{V}^{4+}, \mathrm{Cr}^{6+}\) and \(\mathrm{Mn}^{7+}\)
C \(\mathrm{Ti}^{4+}, \mathrm{V}^{3+}, \mathrm{Cr}^{2+}\) and \(\mathrm{Mn}^{3+}\)
D \(\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}\) and \(\mathrm{Mn}^{5+}\)

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Answer & Solution

Correct Answer

(D) \(\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}\) and \(\mathrm{Mn}^{5+}\)

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Detailed explanation

(d) Among the given series of transition metal ions, one in which all metal ions have \(3 d^2, 3 p^6\) electronic configuration is : Option (d), i.e. \(\mathrm{Ti}(Z=22) \rightarrow \mathrm{Ti}^{2+}\) (has 20 electrons) \(\mathrm{V}(Z=23) \rightarrow \mathrm{V}^{3+}\) (has 20…

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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