Question

Zinc granules are used in laboratory preparation of hydrogen because it consists of _____ which acts as a catalyst and speeds up the rate of reaction.

• A. calcium
• B. copper
• C. silver
• D. iron

Answer 1

The correct option is B copper

Granulated zinc is preferred than pure zinc because the reaction with pure zinc is very slow. Copper impurities present in granulated zinc has a catalysing effect, and thus helps in speeding up the reaction.