In the laboratory preparation of hydrogen, pure zinc is not used becauseA. Pure zinc becomes passive due to the formation of oxide layerB. pure zinc becomes passive due to the formation of sulphate layer over the metalC. pure zinc reacts slowly with the acidD. pure acid reacts with the acid vigorously.

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

1.	In the laboratory preparation of hydrogen, pure zinc is not used becauseA. Pure zinc becomes passive due to the formation of oxide layerB. pure zinc becomes passive due to the formation of sulphate layer over the metalC. pure zinc reacts slowly with the acidD. pure acid reacts with the acid vigorously.
Answer» Correct Answer - C In pure zinc, the surface area of zinc atoms is less due to its compactness and the reaction is slow.

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