JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
The correct decreasing order of spin only magnetic moment values \((\mathrm{BM})\) of \(\mathrm{Cu}^{+}, \mathrm{Cu}^{2+}, \mathrm{Cr}^{2+}\) and \(\mathrm{Cr}^{3+}\) ions is which?
- A \(\mathrm{Cu}^{+} \gt \mathrm{Cu}^{2+} \gt \mathrm{Cr}^{3+} \gt \mathrm{Cr}^{2+}\)
- B \(\mathrm{Cu}^{2+} \gt \mathrm{Cu}^{+} \gt \mathrm{Cr}^{2+} \gt \mathrm{Cr}^{3+}\)
- C \(\mathrm{Cr}^{2+} \gt \mathrm{Cr}^{3+} \gt \mathrm{Cu}^{2+} \gt \mathrm{Cu}^{+}\)
- D \(\mathrm{Cr}^{3+} \gt \mathrm{Cr}^{2+} \gt \mathrm{Cu}^{+} \gt \mathrm{Cu}^{2+}\)
Answer & Solution
Correct Answer
(C) \(\mathrm{Cr}^{2+} \gt \mathrm{Cr}^{3+} \gt \mathrm{Cu}^{2+} \gt \mathrm{Cu}^{+}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{Cu}^{+}:[\mathrm{Ar}] 3 \mathrm{~d}^{10}\), Spin only magnetic moment \(=0\) B.M. \(\mathrm{Cu}^{+2}:[\mathrm{Ar}] 3 \mathrm{~d}^9\), Spin only magnetic moment \(=\sqrt{3}\) B.M. \(\mathrm{Cr}^{+2}:[\mathrm{Ar}] 3 \mathrm{~d}^4\), Spin only magnetic moment…
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