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 electrons paired and are repelled by magnetic fields, in contrast to paramagnetic species, which possess unpaired electrons.

Answer 1

The Correct Option is A

Diamagnetic substances are those that do not contain 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. \bigskip Step 2: Therefore, the correct answer is option (1). \bigskip