Copper subgroup ppt. and arsenic subgroup ppt are separated using $Y A S$ or $N a O H$ .

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Solution

Copper subgroup ppt. and arsenic subgroup ppt are separated using $Y A S$ or $N a O H$

Group IIB sulphides are soluble in $Y A S$ and they react with yellow ammonium sulphide to form thiosalts.

These thiosalts reacts with $H C l$ to form coloured precipitates.

$A s_{2} S_{3}$ is yellow in colour and $S n S$ is brown in colour.

$2 (N H_{4})_{3} s o l u b l e A s S_{4} + 6 H C l ⟶ A s_{2} S_{6} ↓ + 6 N H_{4} C l + 3 H_{2} S$

$(N H_{4})_{2} S n S_{3} + 2 H C l ⟶ S n S_{2} ↓ + 2 N H_{4} C l + H_{2} S$

On the other hand, group IIA sulphides are insoluble in $Y A S$
Hence, $Y A S$ can be used for the separation of group IIA and IIB precipitates.

Similarly $N a O H$ can also be used for separation of group IIA and IIB precipitates.

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