Why are the following metals not used in the lab preparation of hydrogen:
(c) Aluminium?

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Solution

Aluminium reacts with oxygen and forms a protective coating of $A l_{2} O_{3}$ due to its great affinity for oxygen.
So, aluminium does not produce hydrogen with acid.

Chemical reaction:

$4 A l + 3 O_{2} \to 2 A l_{2} O_{3}$

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