Q

Which of the following gas is emitted when a metal reacts with sodium hydroxide?

RPF Constable, 10-Feb-19 S-1 2019
✓ Answer: D Hydrogen
When a metal reacts with sodium hydroxide (NaOH), hydrogen gas is usually emitted. This reaction is a type of single displacement reaction where the metal displaces hydrogen from the hydroxide. Certain amphoteric metals such as aluminium and zinc react with sodium hydroxide to form the corresponding sodium salt and release hydrogen gas. 2Al + 2NaOH + 2H2O → 2NaAlO2 + 3H2↑; Zn + 2NaOH → Na2ZnO2 + H2↑.
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