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Preparations and Uses of Caustic Soda

A combustible...

Question

A combustible gas is liberated when caustic soda solution is heated with:

A

S

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B

N H_{4} C l

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C

I_{2}

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D

Z n

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Solution

The correct option is D $Z n$
Sodium hydroxide reacts with zinc to form soluble sodium zincate $(N a_{2} Z n O_{2})$ along with the liberation of inflammable hydrogen gas.
$Z n + 2 N a O H \to N a_{2} Z n O_{2} ↓ + H_{2}$
Hence option D is correct.

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