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in Chemistry by (79.8k points)

An aqueous solution of CoCl2 on addition of excess of concentrated HCI tums blue due to formation of

(a) [Co(H2O)4Cl2]

(b) [Co(H2O)2Cl4]2-

(c) [CoCl4]2-

(d) [Co(H2O)2Cl2]

1 Answer

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Best answer

The correct option is (c) [CoCl4]2-.

Explanation:

CoCl2 is a weak Lewis acid, reacting with chloride ion to produce salt containing the tetrahedral [CoCl4]2- ion. CoCl2 is blue when anhydrous, and a deep magenta colour when hydrated, for this reason it is widely used as an indicator for water.

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