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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
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B
copper
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C
silver
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D
iron
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Solution

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.

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