JEE Main 2026 Apr 5 Shift 2, Chemistry Q11: Colour, Magnetism And Stability Of Co-ordination Compounds

JEE Main2026Apr 5, Shift 2Chemistry

Identify the correct statements from the following:

(A) $[F e (C_{2} O_{4})_{3}]^{3 -}$ is the most stable complex among $[F e (O H)_{6}]^{3 -}$ , $[F e (C_{2} O_{4})_{3}]^{3 -}$ and $[F e (S C N)_{6}]^{3 -}$

(B) The stability of $[C u (N H_{3})_{4}]^{2 +}$ is greater than that of $[C u (e n)_{2}]^{2 +}$

(D) $[F e (N O_{2})_{3} C l_{3}]^{3 -}$ exhibits linkage isomerism

(E) $N O_{2}^{-}$ and $S C N^{-}$ ligands are NOT ambidentate ligands

Choose the correct answer from the options given below:

A
A, B, C, D and E
B
B, C and D only
C
A, C and D only
D
A, C and E only

Solution

(A) Correct — oxalate is a chelating bidentate ligand; chelation gives the highest stability among the three.

(B) Incorrect — ethylenediamine (en) is a chelating bidentate ligand, so $[C u (e n)_{2}]^{2 +}$ is more stable than $[C u (N H_{3})_{4}]^{2 +}$ .

(C) Correct — $C N^{-}$ is a strong field ligand; $F e^{2 +}$ ( $d^{6}$ ) pairs to give $t_{2 g}^{6} e_{g}^{0}$ , hybridisation $d^{2} s p^{3}$ .

(D) Correct — $N O_{2}^{-}$ is ambidentate (binding through N or O), so the complex can show linkage isomerism.

(E) Incorrect — both $N O_{2}^{-}$ and $S C N^{-}$ are well-known ambidentate ligands.

Correct statements: A, C, D.

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JEE Main 2026 Apr 5 Shift 2, Chemistry Q11: Colour, Magnetism And Stability Of Co-ordination Compounds

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