Coordination Compounds Ques 36
36. Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :
[2018]
| Column I | Column II | ||
|---|---|---|---|
| a. | $Co^{3+}$ | i. | $\sqrt{8} BM$ |
| b. | $Cr^{3+}$ | ii. | $\sqrt{35} BM$ |
| c. | $Fe^{3+}$ | iii. | $\sqrt{3} BM$ |
| d. | $Ni^{2+}$ | iv. | $\sqrt{24} BM$ |
| v. | $\sqrt{15} BM$ |
| a | b | c | d | |
|---|---|---|---|---|
| (a) | iv | v | ii | i |
| (b) | i | ii | iii | iv |
| (c) | iii | v | i | ii |
| (d) | iv | i | ii | iii |
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Answer:
Correct Answer: 36.(a)
Solution:
(a) $Co^{3+}=[Ar] 3 d^{6}$, unpaired $e^{-}(n)=4$
Spin magnetic moment
$=\sqrt{4(4+2)}=\sqrt{24}$ B.M.
$Cr^{3+}=[Ar] 3 d^{3}$, unpaired $e^{-}(n)=3$
Spin magnetic moment
$=\sqrt{3(3+2)}=\sqrt{15}$ B.M.
$Fe^{3+}=[Ar] 3 d^{5}$, unpaired $e^{-}(n)=5$
Spin magnetic moment
$=\sqrt{5(5+2)}=\sqrt{35}$ B.M.
$Ni^{2+}=[Ar] 3 d^{8}$, unpaired $e^{-}(n)=2$
Spin magnetic moment
$=\sqrt{2(2+2)}=\sqrt{8}$ B.M.
BETA
