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An aqueous solution of CoCl(2) on additi...

An aqueous solution of `CoCl_(2)` on addition of excess of conc. `HCl` turns blue due to formation of

A

`[CoCl_4]^(2-)`

B

`[Co(H_2O)_2Cl_4]^(2-)`

C

`[Co(H_2O)_2 2Cl_4]^(2-)`

D

`[Co(H_2O)_4Cl_2]`

Text Solution

Verified by Experts

The correct Answer is:
A
`CoCl_2` is a weak Lewis acid, it reacts with chloride ions to produce salt containing the tetrahedral `[CoCl_4]^(2-)` ion. `CoCl_2` 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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