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Q.

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 $Co {({NO}_{3})}_{2}$ is burned?

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a

${Al}^{3 +}$

b

${Cu}^{2 +}$

c

${Mg}^{2 +}$

d

${Zn}^{2 +}$

answer is D.

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Detailed Solution

The reaction is,

$ZnO + CoO ⟶ \underset{green}{ZnO . CoO}$

$CoO \cdot ZnO$ (Rinmann's green)

The cobalt nitrate charcoal cavity test is replaced by the filter paper ash test.

${Al}_{2} O_{3} . COO$

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