Coordination Chemistry

Step 1: Understanding the statements.
- (A) BF is not a stronger Lewis acid than BCl ; in fact, BCl is a stronger Lewis acid due to the larger size of Cl compared to F .

- (B) CO and CN are indeed good π-accepting ligands, as they have empty molecular orbitals that can accept electron density from metal centers.

- (C) cis-Diaminedichloroplatinum(II) (commonly known as cisplatin) does have a dipole moment due to its asymmetrical arrangement of ligands.

- (D) The central atom in BCl is sp hybridized, but this statement alone is misleading in this context.

Step 2: Conclusion.
The correct answer is (B) CO and CN are good π-accepting ligands.

Step 1: Identify the overall charge

The complex contains 3 K⁺ ions, so the complex ion [Fe(CN)₅NO]³⁻ has a charge of -3.

Step 2: Assign oxidation states

Using the standard approach for nitrosyl complexes:

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Answer: +2