Question

Arrange the following in increasing value of magnetic moments

(i) $\lbrack Fe(CN)_{6}\rbrack^{4 -}$ (ii) $\lbrack Fe(CN)_{6}\rbrack^{3 -}$

(iii) $\lbrack Cr(NH_{3})_{6}\rbrack^{3 +}$ (iv) $\lbrack Ni(H_{2}O)_{4}\rbrack^{2 +}$

• A. (i) < (ii) < (iii) < (iv)
• B. (i) < (ii) < (iv) < (iii)
• C. (ii) < (iii) < (i) < (iv)
• D. (iii) < (i) < (ii) < (iv)

Answer 1

Answer: (B)

(i) < (ii) < (iv) < (iii)

Answer 2

$\lbrack Fe(CN)_{6}\rbrack^{4 -}$ No. of unpaired electrons = 0

$\lbrack Fe(CN)_{6}\rbrack^{3 -}$ No. of unpaired electrons = 1

$\lbrack Ni(H_{2}O)_{4}\rbrack^{2 +}$ No. of unpaired electrons = 2

$\lbrack Cr(NH_{3})_{6}\rbrack^{3 +}$ No. of unpaired electrons = 3