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D and F Block Elements question

2018 · Q86
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D and F Block Elements question

2018 · Q86

NEETChemistryD and F Block ElementsMCQ+4 / −1
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 :
Column - I Column - II
A. Co3+ (i) 8\sqrt 88​ B.M.
B. Cr3+ (ii) 35\sqrt {35}35​ B.M.
C. Fe3+ (iii) 3\sqrt 33​ B.M.
D. Ni2+ (iv) 24\sqrt {24}24​ B.M.
(v) 15\sqrt {15}15​ B.M.
  1. A
    A B C D
    (iv) (v) (ii) (i)
  2. B
    A B C D
    (i) (ii) (iii) (iv)
  3. C
    A B C D
    (iv) (i) (ii) (iii)
  4. D
    A B C D
    (iii) (v) (i) (ii)
View written solutionFree

Correct answer: A

Co3+ = [Ar]3d6 , unpaired e–(n) = 4

Spin magnetic moment (μ\mu μ) = 4(4+2)=24\sqrt {4\left( {4 + 2} \right)} = \sqrt {24} 4(4+2)​=24​ B.M

Cr3+ = [Ar]3d3 , unpaired e–(n) = 3

Spin magnetic moment (μ\mu μ) = 3(3+2)=15\sqrt {3\left( {3 + 2} \right)} = \sqrt {15} 3(3+2)​=15​ B.M.

Fe3+ = [Ar]3d5 , unpaired e–(n) = 5

Spin magnetic moment (μ\mu μ) = 5(5+2)=35\sqrt {5\left( {5 + 2} \right)} = \sqrt {35} 5(5+2)​=35​ B.M.

Ni2+ = [Ar]3d8 , unpaired e–(n) = 2

Spin magnetic moment (μ\mu μ) = 2(2+2)\sqrt {2\left( {2 + 2} \right)} 2(2+2)​ = 8\sqrt 8 8​ B.M.

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