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When sodium carbonate is added in excess...

When sodium carbonate is added in excess to a metal chloride solution followed by the bromine water and then mixture is slightly heated , the solution turns apple green. The metal chloride is `:`

A

`NiCl_(2)`

B

`CoCl_(2)`

C

`CrCl_(2)`

D

`FeCl_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
`CoCl_(2)+2NaHCO_(3)rarrCo(HCO_(3))_(2)+2NaCl`
`CO(HCO_(3))_(2)+4NaHCO_(3)rarrNa_(4)[Co(CO_(3))_(3)]+3H_(2)O+3CO_(2)`
`Br_(2)+H_(2)Orarr2HBr+[O]`
`2Na_(4)[Co(OC_(3))_(3)]+H_(2)O+[O]rarr2Na_(3)[Co(CO_(3))_(3)]("green")+2NaOH`
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