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Home Questions WQTVUVNUTC
Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: Coordination Compounds

Question:

Assertion: [Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3- is weakly paramagnetic.

Reason: H2O is a strong field ligand and CN- is a weak field ligand.

Options:

Assertion and reason both are correct statements and reason is correct explanation for assertion.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

Correct Answer:

Assertion is correct statement but reason is wrong statement.

Explanation:

[Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3- is weakly paramagnetic. 

In case of CN-, 3d electrons pair up leaving one unpaired electron, hybridisation is d2sp3 forming inner orbital complex. In case of H2O (weak ligand), 3d electrons do not pair up, hybridisation is sp3d2 forming an outer orbital complex. As it contains five unpaired electrons so it is strongly paramagnetic. 

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