Match List-I with List-II. List-I (Complex ion) List-II (Spin only magnetic moment in B.M.) (A) \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) (B) \(\left[\mathrm{NiCl}_{4}\right]^{2-}\) (C) \(\left[\mathrm{CoF}_{6}\right]^{3-}\) (D) \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) (I) 4.90 (II) 3.87 (III) 0.0 (IV) 2.83 Choose the correct answer from the options given below:

Spin-only moment B.M., = unpaired electrons. (A) : is , — (II). (B) : tetrahedral ( ), weak-field , — (IV). (C) : ( ), weak-field gives high spin, — (I). (D) : strong-field gives square-planar, low-spin , — (III). Matching: (A)-(II), (B)-(IV), (C)-(I), (D)-(III).

JEE Main · 2024 · 08 Apr 2024 · Shift 2 · Coordination Compounds

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Match List-I with List-II.

List-I
(Complex ion)

List-II
(Spin only magnetic
moment in B.M.)

(A)

[Cr (NH_{3})_{6}]^{3 +}

(B)

[NiCl_{4}]^{2 -}

(C)

[CoF_{6}]^{3 -}

(D)

[Ni (CN)_{4}]^{2 -}

(I) 4.90
(II) 3.87
(III) 0.0
(IV) 2.83

Choose the correct answer from the options given below:

Answer: A → II, B → IV, C → I, D → III

Solution

Spin-only moment

μ = n (n + 2)

B.M.,

n

= unpaired electrons.
(A)

[C r (N H_{3})_{6}]^{3 +}

C r^{3 +}

d^{3}

n = 3 \Rightarrow μ = 15 = 3.87

— (II).
(B)

[N i C l_{4}]^{2 -}

: tetrahedral

N i^{2 +}

(

d^{8}

), weak-field

C l^{-}

n = 2 \Rightarrow μ = 8 = 2.83

— (IV).
(C)

[C o F_{6}]^{3 -}

C o^{3 +}

(

d^{6}

), weak-field

F^{-}

gives high spin,

n = 4 \Rightarrow μ = 24 = 4.90

— (I).
(D)

[N i (C N)_{4}]^{2 -}

: strong-field

C N^{-}

gives square-planar, low-spin

N i^{2 +}

n = 0 \Rightarrow μ = 0

— (III).
Matching: (A)-(II), (B)-(IV), (C)-(I), (D)-(III).

JEE Main · 2024 · 08 Apr 2024 · Shift 2 · Match the columns

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JEE Main · 2024 · 08 Apr 2024 · Shift 2 · Coordination Compounds

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