Question

Why are zinc granules used over zinc dust for the laboratory preparation of hydrogen gas?

• A. The reaction with pure zinc is slow
• B. Pure zinc is unavailable
• C. Pure zinc is expensive
• D. Reaction with pure zinc is too rapid

Answer 1

The correct option is A

The reaction with pure zinc is slow

Zinc granules are used over pure zinc for the laboratory preparation of hydrogen gas because the rate of reaction of pure zinc with dilute sulphuric acid is very fast to be controlled. As the dust has more area of contact, the reaction would be too rapid to control in a laboratory setup.