TS EAMCET · Chemistry · Coordination Compounds

The coordination complex ${[Co {({OH}_{2})}_{6}]}^{2 +}$ has one unpaired electron, which of the following statements are true?
(i) The complex is octahedral.
(ii) The complex is an outer orbital complex.
(iii) The complex is diamagnetic.

A (i) and (iii) only
B (i), (ii) and (iii)
C (i) and (ii) only
D (ii) and (iii) only

Verified Solution

Answer & Solution

Correct Answer

(C) (i) and (ii) only

Step-by-step Solution

Detailed explanation

Co2+ is a d7 ion. Coordination number 6 implies an octahedral complex. Statement (i) is true. Given 1 unpaired electron, the electronic configuration for d7 is t2g6eg1 (low spin). No empty 3d orbitals are available for d2sp3 hybridization. Thus, it forms an outer orbital complex…

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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The coordination complex CoOH262+ has one unpaired electron, which of the following statements are true?(i) The complex is octahedral.(ii) The complex is an outer orbital complex.(iii) The complex is diamagnetic.

Step-by-step Solution

The coordination complex ${[Co {({OH}_{2})}_{6}]}^{2 +}$ has one unpaired electron, which of the following statements are true?
(i) The complex is octahedral.
(ii) The complex is an outer orbital complex.
(iii) The complex is diamagnetic.