JEE Main 2026 · 5 Apr · Shift 2 · Chemistry Q61

ChemistrySingle correct+4 / -1Question 61 of 75

Identify the correct statements from the following

A. $\ce{[Fe(C2O4)3]^3-}$ is the most stable complex among $\ce{[Fe(OH)6]^3-}$ , $\ce{[Fe(C2O4)3]^3-}$ and $\ce{[Fe(SCN)6]^3-}$

B. The stability of $\ce{[Cu(NH3)4]^2+}$ is greater than that of $\ce{[Cu(en)2]^2+}$

C. The hybridization of Fe in $\ce{K4[Fe(CN)6]}$ is $d^2sp^3$

D. $\ce{[Fe(NO2)3Cl3]^3-}$ exhibits linkage isomerism

E. $\ce{NO2-}$ and $\ce{SCN-}$ ligands are NOT ambidentate ligands

Choose the correct answer from the options given below :

A, B, C, D and E

B, C and D only

A, C and D only

A, C and E only

Answer and worked solution

Official answer: C

Each statement.

A: Oxalate is a chelating ligand, so $\ce{[Fe(C2O4)3]^3-}$ is the most stable of the three. True.
B: Ethylenediamine chelates, so $\ce{[Cu(en)2]^2+}$ is more stable than $\ce{[Cu(NH3)4]^2+}$ . False.
C: In $\ce{[Fe(CN)6]^4-}$ , Fe(II) is low-spin $d^6$ , so the hybridisation is $d^2sp^3$ . True.
D: $\ce{NO2-}$ can bind through N or O, so the complex shows linkage isomerism. True.
E: $\ce{NO2-}$ and $\ce{SCN-}$ are ambidentate. False.

Correct: A, C and D.

(C)

JEE Main 2026 · 5 Apr · Shift 2, Chemistry question 61