Chemistry
Which metal is preferred for the preparation of hydrogen
(i) from water?
(ii) from acid?
Hydrogen
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Answer
(i) Reactive metals like sodium react with cold water forming their corresponding oxides and evolving hydrogen.
2Na + 2H2O ⟶2NaOH + H2 ↑
Sodium amalgam (alloy of sodium and mercury) react smoothly with water. Therefore, hydrogen can be safely prepared from this amalgam.
(ii) Zinc reacts with acids liberating hydrogen gas and forming their respective salts.
Zn + 2HCl ⟶ ZnCl2 + H2 ↑
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