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What was the term proposed by Werner for the number of groups bound directly to the metal ion in a coordination complex?

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What was the term proposed by Werner for the number of groups bound directly to the metal ion in a coordination complex?

(a) Primary valence

(b) Secondary valence

(c) Oxidation number

(d) Polyhedra

I have been asked this question during an interview.

This intriguing question originated from Werner’s Theory of Coordination Compounds topic in section Coordination Compounds of Chemistry – Class 12

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Right choice is (b) Secondary valence

Easy explanation: Primary valence of a metal ion is also known as its oxidation number. The secondary valence is equal to coordination number and it is fixed for a metal. Coordination polyhedra is the term for the spatial arrangements of the groups/ions around the metal.

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