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Reactivity with Halogens and Hydrogen (Group 2)

A green mass ...

Question

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

A

aluminium

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B

copper

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C

barium

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D

zinc

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Solution

The correct option is D zinc
Option (D) is correct.
$X$ may contain zinc. Following is cobalt nitrate charcoal test.
$Z n S O_{4} + N a_{2} C O_{3} ⟶ Z n C O_{3} + N a_{2} S O_{4}$
$Z n C O_{3} ⟶ Z n O + C O_{2}$
$2 C o {(N O_{3})}_{2} ⟶ 2 C o O + 4 N O_{2} + O_{2}$
$C o O + Z n O ⟶ C o Z n O_{2} (G r e e n)$

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