Analytical ChemistryHard

Question

Which one of the following cations will give a green coloured ash when a piece of filter paper dipped in a solution containing its salt and Co(NO3)2 is burned ?

Options

A.Cu2+
B.Mg2+
C.Al3+
D.Zn2+

Solution

The filter paper ash test is substitute for cobalt nitrate charcoal cavity test. Double oxide ZnO.CoO formed is green in colour. It is called Rinmann′s green.

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