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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?

(a) $Cu^{2+}$
(b) $Mg^{2+}$
(c) $Al^{3+}$
(d) $Zn^{2+}$
Can you answer this question?

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Answer: $Al^{3+}$
The filter paper ash test is substitute for cobalt nitrate charcoal cavity test. Double oxide $Al_3O_3.CaO$ formed is blue in colour.
answered Feb 1, 2014 by mosymeow_1

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