A green mass is formed in the charcoal cavity test when a colourless salt (X) is fused with cobalt nitrate. (X) may contain

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Aluminium

Copper

Barium

Zinc

answer is D.

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Detailed Solution

Follow cobalt nitrate charcoal test.ZnSO4+Na2CO3⟶ZnCO3+Na2SO4ZnCO3⟶ZnO+CO22CoNO32⟶2CoO+4NO2+O2CoO+ZnO⟶CoZnO2 (Green)

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