Question

The diamagnetic species is :
At. No. Co = 27, Fe =26, Ni= 28]

• A. \( [Ni(CN)_4]^{2-} \)
• B. \( [NiCl_4]^{2-} \)
• C. \( [Fe(CN)_6]^{3-} \)
• D. \( [CoF_6]^{3-} \)

Hint:

Diamagnetic species have all their electrons paired and are repelled by a magnetic field, unlike paramagnetic species, which have unpaired electrons.

Answer 1

The Correct Option is A

Diamagnetic species lack unpaired electrons. In the provided options, \( [Ni(CN)_4]^{2-} \) is diamagnetic as the \( Ni^{2+} \) ion within this complex contains no unpaired electrons.
Step 2: Therefore, option (1) is the correct choice.