TS EAMCET · Chemistry · p Block Elements (Group 13 & 14)

Which of the following complex ions does not exist?

A ${[B {(H_{2} O)}_{6}]}^{3 +}$
B ${[Al {(H_{2} O)}_{6}]}^{3 +}$
C ${[Ga {(H_{2} O)}_{6}]}^{3 +}$
D ${[In {(H_{2} O)}_{6}]}^{3 +}$

Verified Solution

Answer & Solution

Correct Answer

(A) ${[B {(H_{2} O)}_{6}]}^{3 +}$

Step-by-step Solution

Detailed explanation

Boron has the atomic number of five. It has the electronic configuration of 1s22s22p1. It does not have the d-orbitals. It can not expand the orbitals. So, it can not form the hexacomplex with boron. So, the complex ion BH2O63+ does not exist.

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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