Q38 / 150 · MHT CET 2023 (12 May Shift 1) · Chemistry

What is the numerical value of spin only magnetic moment of copper in +2 state?

  • A
    0.0
  • Correct answer
    B
    1.73
  • C
    2.78
  • D
    4.4

Solution

$\begin{aligned} & \mathrm{Cu}(\mathrm{Z}=29):[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^1 \\ & \mathrm{Cu}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^9 \\ & \text { No. of unpaired } \mathrm{e}^{-}=1 \\ & \mu=\sqrt{\mathrm{n}(\mathrm{n}+2)}=\sqrt{1(1+2)}=\sqrt{3}=1.73 \mathrm{BM}\end{aligned}$

Hence, the correct answer is option: 'B'.

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