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

pure zinc becomes passive due to the formation of oxide layer

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

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pure zinc reacts slowly with the acid

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pure zinc reacts with acid vigorously and violently

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Solution

The correct option is D pure zinc reacts slowly with the acid
Pure zinc reacts very slowly with acids, which is why it is not used in laboratory preparation of hydrogen gas.

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Granulated zinc is preferred over pure zinc to produce hydrogen by reacting with acids:-

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