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.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The major product of the reaction is
The valency of cuprammonium ion is
Choose the correct statement($s$) among the following.
→$(A)$ $SnCl _2 \cdot 2 H _2 O$ is a reducing agent.
$(B)$ $SnO _2$ reacts with $KOH$ to form $K _2\left[ Sn ( OH )_6\right]$.
$(C)$ A solution of $PbCl _2$ in $HCl$ contains $Pb ^{2+}$ and $Cl ^{-}$ions.
$(D)$ The reaction of $Pb _3 O _4$ with hot dilute nitric acid to give $PbO _2$ is a redoxreaction.
The freezing point of $1$ percent solution of lead nitrate in water will be
→Which colourless gas evolves, when $N{H_4}Cl$ reacts with zinc in a dry cell battery
→From amongst the following alcohols the one that would react fastest with conc. $HCl$ and anhydrous $ZnCl_2,$ is
→Assertion : Acetylene on reacting with sodamide gives sodium acetylide and ammonia.
→Reason : $sp$ hybridised carbon atoms of acetylene are considerably electronegative.
In the reaction, $A + B$ $\rightleftharpoons$ $2C$, at equilibrium, the concentration of $A$ and $B$ is $0.20\,\,mol\,\,{l^{ - 1}}$ each and that of $C$ was found to be $0.60\,\,mol\,\,{l^{ - 1}}$. The equilibrium constant of the reaction is
→${K_f}$ of $1,4\,-$ dioxane is $4.9\,mo{l^{ - 1}}$ for $1000\,g$. The depression in freezing point for a $ 0.001\,m$ solution in dioxane is
→When $FeCl_3$ reacts with $K_4[Fe(CN)_6]$ then which of the following compound is formed
→