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Which of the following is the coordination entity in K2[Zn(OH)4]?

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Which of the following is the coordination entity in K2[Zn(OH)4]?

(a) K^+

(b) Zn^2+

(c) OH^–

(d) [Zn(OH)4]^2-

This question was addressed to me during an internship interview.

My query is from Definitions topic in portion Coordination Compounds of Chemistry – Class 12

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The correct option is (d) [Zn(OH)4]^2-

To explain I would say: A coordination entity consists of a central metal atom bonded to a fixed number of atoms/molecules. Here, K^+ is the counter ion, OH is the molecule bonded to the central atom which is Zn.

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