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An aqueous solution of COCL2 on addition...

An aqueous solution of `COCL_2` on addition of excess of concentrated `HCl` turns blue due to formation of

A

`[Co(H_(2)O)_(4)Cl_(2)]`

B

`[Co(H_(2)O)_(2)Cl_(4)]^(2-)`

C

`[CoCl_(4)]^(2-)`

D

`[Co(H_(2)O)_(2)Cl_(2)]`

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The correct Answer is:
C
`CoCl_(2)` is a weak Lewis acid, reacting with chloride ion to produce salt containing the tetrahedral `[CoCl_(4)]^(2-)" ion. "CoCl_(2)` is blue when anhydrous, and a deep magneta colour when hydrated, for this reason it is widely used as an indicator for water.
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