COMEDK · Chemistry · 24. Coordination Compounds

A d - block metal \(\mathrm{X}(\mathrm{Z}=26)\) forms a compound \([\mathrm{X}(\mathrm{CN})_2(\mathrm{CO})_4]^{+}\). Calculate its spin magnetic moment value.

A 3.87 BM
B 2.83 BM
C 5.92 BM
D 1.73 BM

Verified Solution

Answer & Solution

Correct Answer

(D) 1.73 BM

Step-by-step Solution

Detailed explanation

The metal X is Iron (Fe) with atomic number \(Z = 26\). The electronic configuration of Fe is \([Ar] 3d^{6} 4s^{2}\). In the complex \([Fe(CN)_{2}(CO)_{4}]^{+}\), let the oxidation state of Fe be \(x\). Since \(CN^{-}\) is \(-1\) and \(CO\) is neutral, we have…

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.

Same subject

Match the Coordination compounds given in Column I with their characteristic features listed in Column II.

S.No.	Coordination compounds	S.No.	Characteristic features
W	\([Co(NH_3)_5Cl]Cl_2\)	P	Oxidation state \(= +3\), Configuration \(= d^5\), \(\mu = 5.92\) BM
X	\(K_4[Mn(CN)_6]\)	Q	Oxidation state \(= +3\), Configuration \(= d^3\), \(\mu = 3.87\) BM
Y	\([CrCl_2(py)_3]\)	R	Oxidation state \(= +3\), Configuration \(= d^6\), \(\mu = 0\) BM
Z	\(Cs[FeCl_4]\)	S	Oxidation state \(= +2\), Configuration \(= d^5\), \(\mu = 1.732\) BM

COMEDK 2023 Medium

Explore more questions on app

From COMEDK

Explore more questions on app