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Preparation of Hydrogen from Cold Water and Metals

When zinc met...

Question

When zinc metal is heated with caustic soda solution, the gas evolved is :
(1) hydrogen
(2) carbon dioxide
(3) oxygen
(4) hydrogen choride

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Solution

When Zn metal is heated with caustic soda(NaOH) solution, then hydrogen gas evolves.
$Zn (s) + 2 NaOH (aq) \to {Na}_{2} {ZnO}_{2} (aq) + H_{2} (g)$

Hence, the correct answer is option 1.

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