ChemistryJEE Main 2 Apr 2026, Shift 2·Q11·MCQ·Easy–moderate

Coordination Compounds · Coordination isomerism

Which of the following complexes will show coordination isomerism ?

(Take coordination isomerism as the interchange of ligands between the cationic and anionic entities of different metals.)

(A) $\ce{[Ag(NH3)2][Ag(CN)2]}$
(B) $\ce{[Co(NH3)6][Cr(CN)6]}$
(C) $\ce{[Co(NH3)6][Co(CN)6]}$
(D) $\ce{[Fe(NH3)6][Co(CN)6]}$
(E) $\ce{[Co(NH3)6][Fe(CN)6]}$

Choose the correct answer from the options given below :

(1)B, C and D Only
(2)B, D and E Only
(3)A, C and D Only
(4)C, D and E Only

We corrected a printing error in the original paper

Assumption “(Take coordination isomerism as the interchange of ligands between the cationic and anionic entities of different metals.)” added and answer corrected; the source states no definition and its key accepts (1), (2) and (4), since in the broad sense C (two Co centres) also qualifies and no option lists B, C, D and E; with the textbook definition only B, D and E qualify.

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See the full 2 Apr 2026, Shift 2 paper