Co-Ordination Compounds Question 282
Question: Which of the following paramagnetic ions would exhibit a magnetic moment (spin only) of the order of 5 BM? (At. Nos. Mn = 25, Cr = 24, V = 23, Ti =22)
Options:
A) $ M{n^{2+}} $
B) $ T{i^{2+}} $
C) $ {V^{2+}} $
D) $ C{r^{2+}} $
Show Answer
Answer:
Correct Answer: D
Solution:
| Ion | Electronic Configuration | Magnetic moment $ ( \sqrt{n(n+2)} ) $ |
|---|---|---|
| $ C{r^{2+}} $ | $ d^{4} $ | $ \sqrt{4(4+2)}=4.9 $ |
| $ M{n^{2+}} $ | $ d^{5} $ | $ \sqrt{5(5+2)}=5.8 $ |
| $ T{i^{2+}} $ | $ d^{2} $ | $ \sqrt{2(2+2)}=2.4 $ |
| $ {V^{2+}} $ | $ d^{3} $ | $ \sqrt{3(3+2)}=3.8 $ |
Hence $ C{r^{2+}} $ has magnetic moment of the order of 5 B.M.
