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 C. pure zinc reacts slowly with the acid D. pure zinc reacts with acid vigorously and violently
Correct Answer: C
Explanation
Pure zinc is not used in the laboratory preparation of hydrogen because it is non-porous in nature. As a result, the reaction would be very slow, thus, impurities like copper is added to the zinc to increase the speed of the reaction.
