JEE Advanced 2026 Chemistry question

ChemistryCoordination CompoundsJEE Advanced 2026

Consider that the coordinating atoms of the ligands in *cis*-[Co(NH)Cl]Cl and *mer*-[Co(NH)Cl] octahedral complexes are at the vertices of an octahedron. The sum of total number of the triangular faces in both the complexes having one N atom and two Cl atoms at their corners is.

Answer: 6

Solution

Place the six donor atoms at . An octahedron has **8 triangular faces**, and each face is formed by choosing one vertex from each of the three axes — i.e. one of , one of and one of . We must count faces whose corners are exactly **two Cl and one N**. **Complex 1:

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Question ID VK-104801