JEE Main 2026 Apr 2 Shift 1, Chemistry Q12: Colour, Magnetism And Stability Of Co-ordination Compounds

JEE Main2026Apr 2, Shift 1Chemistry

Match List - I with List - II.

List - I Chromium (III) Complexes (en = ethylene diamine)	List - II $Δ_{0}$ (cm $^{- 1}$ )
A. $[C r (C N)_{6}]^{3 -}$	I. $15, 060$
B. $[C r F_{6}]^{3 -}$	II. $17, 400$
C. $[C r (H_{2} O)_{6}]^{3 +}$	III. $22, 300$
D. $[C r (e n)_{3}]^{3 +}$	IV. $26, 600$

Choose the correct answer from the options given below :

Solution

$Δ_{0}$ depends on ligand field strength, which follows the spectrochemical series:

$C N^{-} > e n > H_{2} O > F^{-}$

Mapping the largest $Δ_{0}$ to the strongest field ligand and so on:

$[C r (C N)_{6}]^{3 -} \to 26, 600$ (IV)

$[C r (e n)_{3}]^{3 +} \to 22, 300$ (III)

$[C r (H_{2} O)_{6}]^{3 +} \to 17, 400$ (II)

$[C r F_{6}]^{3 -} \to 15, 060$ (I)

Hence A-IV, B-I, C-II, D-III.

Concept behind this question

Concept-wise practice with instant solutions on Fundamenthol.