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A blue coloured residue obtained in coba...

A blue coloured residue obtained in cobalt nitrate charcoal cavity test is due to

A

`Zn^(2+)`

B

`Mg^(2+)`

C

`Sn^(2+)`

D

`Al^(3+)`

Text Solution

Verified by Experts

`Al_(2)O_(3).CoO` formed in the test is blue in colour.
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