MCQ
Which of the following compounds is expected to be coloured
- A$Ag_2SO_4$
- ✓$CuF_2$
- C$MgF_2$
- D$CuCl$
✓
Answer
Correct option: B.
$CuF_2$
b
$A g_{2} S O_{4}$ contain $A g^{+}$ ion having outer electronic configuration of $4 d^{10}$ with 0
unpaired electrons and is colourless.
$CuF _{2}$ contains $Cu ^{2+}$ ion having outer electronic configuration of $3 d^{9}$ with 1
unpaired electron and is coloured.
$M g F_{2}$ contains $M g^{2+}$ with 0 unpaired electrons having outer electronic configuration of $3 s^{2}$ and is colourless.
$CuCl$ contains $Cu ^{+}$ ion having outer electronic configuration of $3 d ^{10}$ with $O$
unpaired electrons and is colourless.
Hence, option $B$ is correct.
$A g_{2} S O_{4}$ contain $A g^{+}$ ion having outer electronic configuration of $4 d^{10}$ with 0
unpaired electrons and is colourless.
$CuF _{2}$ contains $Cu ^{2+}$ ion having outer electronic configuration of $3 d^{9}$ with 1
unpaired electron and is coloured.
$M g F_{2}$ contains $M g^{2+}$ with 0 unpaired electrons having outer electronic configuration of $3 s^{2}$ and is colourless.
$CuCl$ contains $Cu ^{+}$ ion having outer electronic configuration of $3 d ^{10}$ with $O$
unpaired electrons and is colourless.
Hence, option $B$ is correct.
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