Atomic number of Cr and Fe are 24 and 26 respectively. Which of

Question

Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron?

Options:

A . [Cr(NH3)6]+3

B . [Fe(CO)5]

C . [Fe(CN)6]−4

D . [Cr(CO)6]

Answer: Option A
:
A
All metal carbonyls are diamagnetic cyanide complexes are also diamagnetic. Cyanide ion and Carbonyls are strong field ligands causing d-orbital electrons of metal ion to pair up.

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