Name a gas which turns:
Anhydrous copper sulphate powder blue.

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Solution

1. It is water vapor, $H_{2} O$ .
2. Water vapor turns anhydrous Copper Sulphate ( $C u S O_{4}$ ) into blue.
$C u S O_{4} + 5 H_{2} O \to C u S O_{4} . 5 H_{2} O$
CopperSulphate Water CopperSulphatePentahydrate
3. Water vapor does not change the color of the litmus paper as it is a neutral compound.
Water vapor ( $H_{2} O$ ) turns anhydrous Copper Sulphate ( $C u S O_{4}$ ) powder blue.

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Name a gas which turns: Anhydrous copper sulphate powder blue.

Name a gas which turns:
Anhydrous copper sulphate powder blue.