Match List-I with List-II. List-I (Complex): (A) \(\left[\mathrm{CoF}_{6}\right]^{3-}\) (B) \(\left[\mathrm{NiCl}_{4}\right]^{2-}\) (C) \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) (D) \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) List-II (Hybridisation of central metal ion): (I) \(\mathrm{d}^{2} \mathrm{sp}^{3}\) (II) \(\mathrm{sp}^{3}\) (III) \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) (IV) \(\mathrm{dsp}^{2}\) Choose the correct answer from the options given below :

Crystal field splitting fixes the hybridisation of each complex. : is ; the weak-field causes no pairing, so the outer orbitals are used — . : is ; weak-field gives a tetrahedral geometry with hybridisation. : is ; the strong-field forces all six d-electrons to pair into three orbitals, freeing two…

JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Coordination Compounds

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Match List-I with List-II.

List-I (Complex):
(A)

[CoF_{6}]^{3 -}

(B)

[NiCl_{4}]^{2 -}

(C)

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

(D)

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

List-II (Hybridisation of central metal ion):
(I)

d^{2} sp^{3}

(II)

sp^{3}

(III)

sp^{3} d^{2}

(IV)

dsp^{2}

Choose the correct answer from the options given below :

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

Solution

Crystal field splitting fixes the hybridisation of each complex.

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

C o^{3 +}

3 d^{6}

; the weak-field

F^{-}

causes no pairing, so the outer

4 d

orbitals are used —

s p^{3} d^{2}

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

N i^{2 +}

3 d^{8}

; weak-field

C l^{-}

gives a tetrahedral geometry with

s p^{3}

hybridisation.

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

C o^{3 +}

3 d^{6}

; the strong-field

N H_{3}

forces all six d-electrons to pair into three orbitals, freeing two inner

3 d

orbitals for bonding —

d^{2} s p^{3}

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

N i^{2 +}

3 d^{8}

; strong-field

C N^{-}

pairs the electrons and leaves one

3 d

orbital free for a square-planar

d s p^{2}

arrangement.

So A pairs with

s p^{3} d^{2}

, B with

s p^{3}

, C with

d^{2} s p^{3}

, and D with

d s p^{2}

JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Match the columns

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JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Coordination Compounds

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