Verified Solution • 2025–26 Session moderate

QNEET-2018-Ch-874: NEET 2018 Chemistry - Class 12 NEET-2018-Ch-874 Solution: Match the metal ions given in Column I with the spin magnetic…

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.

Co^{3+}

(i)

\sqrt{8}\ \text{B.M.}

Cr^{3+}

(ii)

\sqrt{35}\ \text{B.M.}

Fe^{3+}

(iii)

\sqrt{3}\ \text{B.M.}

Ni^{2+}

(iv)

\sqrt{24}\ \text{B.M.}

(v)

\sqrt{15}\ \text{B.M.}

A B C D (iv) (v) (ii) (i) A B C D (i) (ii) (iii) (iv) A B C D (iv) (i) (ii) (iii) A B C D (iii) (v) (i) (ii)

Multiple Choice Options

A A B C D (iv) (v) (ii) (i)
B A B C D (i) (ii) (iii) (iv)
C A B C D (iv) (i) (ii) (iii)
D A B C D (iii) (v) (i) (ii)

Step-by-Step Verified Solution

Co 3+ = [Ar]3d 6 , unpaired e � (n) = 4 Spin magnetic moment ( _ ) = 4 ( 4 + 2 ) = 24 B.M Cr 3+ = [Ar]3d 3 , unpaired e � (n) = 3 Spin magnetic moment ( _ ) = 3 ( 3 + 2 ) = 15 B.M. Fe 3+ = [Ar]3d 5 , unpaired e � (n) = 5 Spin magnetic moment ( _ ) = 5 ( 5 + 2 ) = 35 B.M. Ni 2+ = [Ar]3d 8 , unpaired e � (n) = 2 Spin magnetic moment ( _ ) = 2 ( 2 + 2 ) = 8 B.M.

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