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Standard XII
Chemistry
Preparation of Hydrogen
Question
In the laboratory preparation of hydrogen, pure zinc is not used because:
pure zinc becomes passive due to the formation of oxide layer
pure zinc reacts with acid vigorously and violently
pure zinc becomes passive due to the formation of sulphate layer over the metal
pure zinc reacts slowly with the acid
A
pure zinc becomes passive due to the formation of sulphate layer over the metal
B
pure zinc reacts slowly with the acid
C
pure zinc becomes passive due to the formation of oxide layer
D
pure zinc reacts with acid vigorously and violently
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Solution
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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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In the laboratory preparation of hydrogen, pure zinc is not used because:
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Why are zinc granules used over pure zinc for the laboratory preparation of hydrogen gas?
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Assertion(A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas.
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