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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_2O)_4 Cl_2]`

B

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

C

`[CoCl_4]^(2-)`

D

`[Co(H_2O)_2 Cl_2]`

Text Solution

Verified by Experts

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 magenta colour when hydrated, for this reason it is widely used as an indicator for water.
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