JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Coordination Compounds

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The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of

CoCl_{3}

4 NH_{3}

is ____ .
(Round off to the Nearest Integer).

Answer: 2

Solution

The compound

CoC l_{3} \cdot 4N H_{3}

is the salt trans-

[CoC l_{2} (N H_{3})_{4}] Cl

. Inside the coordination sphere the four ammonia molecules are the neutral ligands, while the two chlorides sit at the trans positions and the third chloride is ionic.
Ethylenediamine binds through both of its nitrogen atoms, so one molecule occupies two coordination sites and displaces two ammonia molecules.
Replacing all four ammonia molecules therefore calls for 2 equivalents of ethylenediamine.

JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Integer answer

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