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 are those that do not have any unpaired electrons. Among the given options, \( [Ni(CN)_4]^{2-} \) is diamagnetic because the \( Ni^{2+} \) ion in this complex has no unpaired electrons.
Step 2: Thus, the correct answer is option (1).