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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

(a) `[Co(H_2O)_4Cl_2]`

B

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

C

(c) `[CoCl_4]^(2-)`

D

(d) `[Co(H_2O)_2Cl]_2`

Text Solution

Verified by Experts

The correct Answer is:
C
`CoCl_2` is a weak Lewis acid, reacting with chloride ion to produces 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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A2Z-COORDINATION COMPOUNDS-Section D - Chapter End Test
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  14. Which would exhibit ionisation isomerism?

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