1.

Which one of the following cation will give a blue coloured ash when a piece of filter paper dipped in a solution containing its salt and Co(NO_3)_2 is burned?

Answer»

`Cu^(2+)`
`Mg^(2+)`
`AL^(3+)`
`ZN^(2+)`

SOLUTION :The filter paper ash test is substitute for cobalt nitrate charcoal cavity test. Double oxide `Al_(2)O_(3).CO O` formed is blue in colour.


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