Given below are two statements: Statement I: Hybridisation, shape and spin only magnetic moment of K₃[Co(CO₃)₃] is sp³d², octahedral and 4.9 BM respectively. Statement II: Geometry, hybridisation and spin only magnetic moment values (BM) of the ions [Ni(CN)₄]²⁻, [MnBr₄]²⁻ and [CoF₆]³⁻ respectively are square planar, tetrahedral, octahedral; dsp², sp³, sp³d² and 0, 5.9, 4.9. In the light of the above statements, choose the correct answer from the options given below.

Hybridisation shape and spin only magnetic moment statements for coordination compounds

Q. Given below are two statements:

Statement I: Hybridisation, shape and spin only magnetic moment of K₃[Co(CO₃)₃] is sp³d², octahedral and 4.9 BM respectively.

Statement II: Geometry, hybridisation and spin only magnetic moment values (BM) of the ions [Ni(CN)₄]²⁻, [MnBr₄]²⁻ and [CoF₆]³⁻ respectively are square planar, tetrahedral, octahedral; dsp², sp³, sp³d² and 0, 5.9, 4.9.

In the light of the above statements, choose the correct answer from the options given below.

(A) Both Statement I and Statement II are false

(B) Statement I is true but Statement II is false

(D) Statement I is false but Statement II is true

Correct Answer: Both Statement I and Statement II are true

Explanation

In K₃[Co(CO₃)₃], cobalt is in +3 oxidation state with electronic configuration d⁶. Carbonate acts as a weak field ligand, so pairing does not occur. The complex forms an octahedral geometry with sp³d² hybridisation and has four unpaired electrons, giving a spin only magnetic moment close to 4.9 BM. Hence, Statement I is correct.

For [Ni(CN)₄]²⁻, CN⁻ is a strong field ligand, causing pairing of electrons and leading to square planar geometry with dsp² hybridisation and zero magnetic moment. For [MnBr₄]²⁻, Br⁻ is a weak field ligand, resulting in tetrahedral geometry with sp³ hybridisation and five unpaired electrons giving a magnetic moment of about 5.9 BM. For [CoF₆]³⁻, F⁻ is a weak field ligand, producing an octahedral complex with sp³d² hybridisation and four unpaired electrons corresponding to a magnetic moment of about 4.9 BM. Hence, Statement II is also correct.

Therefore, both Statement I and Statement II are true.

Explanation

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