MCQ
Which of the following complex has zero magnetic moment (spin only)?
- A$[Ni(NH_3)_6]Cl_2$
- B$Na_3[FeF_6 ]$
- C$[Cr(H_2O)_6]SO_4$
- ✓$K_4[Fe(CN)_6 ]$
✓
Answer
Correct option: D.
$K_4[Fe(CN)_6 ]$
d
$[Ni{(N{H_3})_6}]C{l_2}$ $\to $ $s{p^3}{d^2}$ hybridisation $\to $ $2$ unpaired electrons
$[Ni{(N{H_3})_6}]C{l_2}$ $\to $ $s{p^3}{d^2}$ hybridisation $\to $ $2$ unpaired electrons
$N{a_3}[Fe{F_6}]$ $\to $ $s{p^3}{d^2}$ hybridisation $\to $ $3$ unpaired electrons
$[Cr{({H_2}O)_6}]S{O_4}$ $\to $ ${d^2}s{p^3}$ hybridisation $\to $ $3$ unpaired electrons
${K_4}[Fe{(CN)_6}]$ $\to $ ${d^2}s{p^3}$ hybridisation $\to $ No unpaired electrons
Zero magnetic moment means all the electrons paired.
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