Why Zinc is the most preferred metal in the laboratory for preparation of hydrogen by the metal-acid reaction?

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Solution

Zinc (Zn) is the most preferred metal in the laboratory because metals like potassium (K) and sodium (Na) react violently with acid because of their high reactivity.

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Give reason for the following

1. Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals.

2. Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.

3. Hydrogen and alkali metals of group [1A] react with copper [II] oxide to give copper.

4. Hydrogen is collected by the downward displacement of water and not even though it is lighter than air.

5. A Mixture of hydrogen and chlorine can be separated by passage through a porous pot

Why is granulated zinc used in laboratory preparation of hydrogen and why is hydrogen collected by downward displacement of water?

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