The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are [2025]

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Q.
The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are [2025]

A.   ${Cr}^{2 +}$
B.   ${Fe}^{2 +}$
C.   ${Fe}^{3 +}$
D.   ${Co}^{2 +}$
E.   ${Mn}^{3 +}$

Choose the correct answer from the options given below:

1 A, C and E only

2 A, D and E only

3 B and E only

4 A, B and E only

Ans.
(4)

$μ = \sqrt{n (n + 2)} = 4.9$

$n = 4$

Thus, ions with 4 unpaired electrons have dipole moment 4.9 BM.

Ion Electronic configuration Number of unpaired electrons (n)

(A) ${Cr}^{2 +}$ ${}_{18}{[Ar]}$ $3 d^{4}$ 4

(B) ${Fe}^{2 +}$ ${}_{18}{[Ar]}$ $3 d^{6}$ 4

(C) ${Fe}^{3 +}$ ${}_{18}{[Ar]}$ $3 d^{5}$ 5

(D) ${Co}^{2 +}$ ${}_{18}{[Ar]}$ $3 d^{7}$ 3

(E) ${Mn}^{3 +}$ ${}_{18}{[Ar]}$ $3 d^{4}$ 4

Solution

Q.
The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are [2025]

A.   ${Cr}^{2 +}$
B.   ${Fe}^{2 +}$
C.   ${Fe}^{3 +}$
D.   ${Co}^{2 +}$
E.   ${Mn}^{3 +}$

Choose the correct answer from the options given below:

1 A, C and E only

2 A, D and E only

3 B and E only

4 A, B and E only

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Ion	Electronic configuration	Number of unpaired electrons (n)
(A) ${Cr}^{2 +}$	${}_{18}{[Ar]}$ $3 d^{4}$	4
(B) ${Fe}^{2 +}$	${}_{18}{[Ar]}$ $3 d^{6}$	4
(C) ${Fe}^{3 +}$	${}_{18}{[Ar]}$ $3 d^{5}$	5
(D) ${Co}^{2 +}$	${}_{18}{[Ar]}$ $3 d^{7}$	3
(E) ${Mn}^{3 +}$	${}_{18}{[Ar]}$ $3 d^{4}$	4

Solution

Q. The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are [2025] A. Cr2+ B. Fe2+ C. Fe3+ D. Co2+ E. Mn3+ Choose the correct answer from the options given below:

1 A, C and E only

2 A, D and E only

3 B and E only

4 A, B and E only

Ans. (4) μ=n(n+2)=4.9 n=4 Thus, ions with 4 unpaired electrons have dipole moment 4.9 BM. Ion Electronic configuration Number of unpaired electrons (n) (A) Cr2+ [Ar]183d4 4 (B) Fe2+ [Ar]183d6 4 (C) Fe3+ [Ar]183d5 5 (D) Co2+ [Ar]183d7 3 (E) Mn3+ [Ar]183d4 4

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Q.
The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are [2025]

A. ${Cr}^{2 +}$
B. ${Fe}^{2 +}$
C. ${Fe}^{3 +}$
D. ${Co}^{2 +}$
E. ${Mn}^{3 +}$

Choose the correct answer from the options given below: