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Question

In the laboratory preparation of hydrogen, pure zinc is not used because:
  1. pure zinc becomes passive due to the formation of oxide layer
  2. pure zinc reacts with acid vigorously and violently
  3. pure zinc becomes passive due to the formation of sulphate layer over the metal
  4. 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
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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