Question

Why are zinc granules used over pure zinc 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. None of the above.

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 dil.sulphuric acid is very low. While the impurities present in zinc granules speed up the reaction between zinc and dil. sulphuric acid.