Question

In the laboratory preparation of hydrogen, pure zinc is not used because:

A

pure zinc becomes passive due to the formation of oxide layer

B

pure zinc becomes passive due to the formation of sulphate layer over the metal

C

pure zinc reacts slowly with the acid

D

pure zinc reacts with acid vigorously and violently

Medium

Solution

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Correct option is C)

Pure zinc reacts very slowly with acids, which is why it is not used in laboratory preparation of hydrogen gas.

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