JEE Main 2026 · 6 Apr · Shift 2 · Chemistry Q61

ChemistrySingle correct+4 / -1Question 61 of 75

Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ?

A. $\ce{[NiCl4]^2-}$ - $sp^3$ , tetrahedral, paramagnetic

B. $\ce{[Ni(NH3)6]^2+}$ - $sp^3d^2$ , octahedral, paramagnetic

C. $\ce{[Ni(CO)4]}$ - $sp^3$ , tetrahedral, paramagnetic

D. $\ce{[Ni(CN)4]^2-}$ - $dsp^2$ , square planar, diamagnetic

Choose the correct answer from the options given below :

A, B, C and D

B, C and D only

A, C and D only

A, B and D only

Answer and worked solution

Official answer: D

Each complex.

A: $\ce{[NiCl4]^2-}$ , weak field, $sp^3$ , tetrahedral, 2 unpaired electrons. Correct.
B: $\ce{[Ni(NH3)6]^2+}$ , $sp^3d^2$ , octahedral, 2 unpaired. Correct.
C: $\ce{[Ni(CO)4]}$ , Ni(0) $sp^3$ , tetrahedral, but diamagnetic. Incorrect.
D: $\ce{[Ni(CN)4]^2-}$ , $dsp^2$ , square planar, diamagnetic. Correct.

Correct: A, B and D.

(D)

Topics:Valence bond theory Magnetic properties and colour

JEE Main 2026 · 6 Apr · Shift 2, Chemistry question 61