Question

why are granulated zinc used in laboratory to prepare hydrogen gas ?

Answer 1

Granulated zinc gives more surface area for the acid to act, so hydrogen is formed faster. Also, granulated zinc has copper as an impurity, which catalyses the reaction.

Answer 2

Importance of granulated zinc in laboratory preparation of hydrogen gas

Explanation:

• The zinc metal with high surface area and high particle size are called zinc granules.

• The particle size of zinc granules is very high when compared to the zinc powder.
• It is preferred for laboratory preparation of hydrogen gas due to the following reasons:

1. As mentioned earlier, it has a high surface area due to which it facilitates reaction in a better way.
2. It contains copper in trace amounts which can be triggered to acts as a catalyst during the required condition.
3. It can react with many acids which yield hydrogen gas.

Learn more about zinc granules

State the role of zinc granules in preparation of sample solution.

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Take a few zinc granules in a conical flask or test tube. Add dilute hydrochloric acid or sulfuric acid to this. Do you observe anything happening around the zinc granules? Touch the conical flask or test tube. Is there any change in its temperature.

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