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Question

The correct labeling of different terms used in coordination compounds is:

A
(i) Central atoms, (ii) Ionisation sphere, (iii) Coordination number, (iv) Ligands
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B
(i) Ligands, (ii) Coordination number, (iii) Valency, (iv) Ionic sphere
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C
(i) Ionisation sphere, (ii) Ligands, (iii) Coordination number, (iv) Central atom
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D
(i) Ligands, (ii) Ionisation sphere, (iii) Coordination number, (iv) Central atom
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Solution

The correct option is D (i) Ligands, (ii) Ionisation sphere, (iii) Coordination number, (iv) Central atom
For the given complex compound, ammonia is a ligand, it donates lone pair of electrons to cobalt (central metal atom) and forms coordinate bond.

Coordination number is 6 as ammonia ligand coordinate to central metal.

The molecule or ionic species present outside the coordination sphere constitute the ionisation sphere.
Here, the chlorine atoms outside the square brackets is ionisation sphere

Hence, option (d) is correct.

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