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

Options

A. Pure zinc becomes passive due to the formation of oxide layer
B. pure zinc becomes passive due to the formation of sulphate layer over the metal
C. pure zinc reacts slowly with the acid
D. pure acid reacts with the acid vigorously.

Answer

C

Explanation

In pure zinc, the surface area of zinc atoms is less due to its compactness and the reaction is slow.