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Hydrochloric Acid

When zinc is ...

Question

When zinc is dropped in dilute solution of HCl then how will you collect the gas produced ?Is this gas lighter or heavier than air?

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Solution

The hydrogen gas evolved by reaction of acid with n is collected by downward displacement of water. The hydrogen gas is lighter than water and hence it pushes the water downwards.

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Q. When different metals like zinc, iron or tin were dropped in dilute sulphuric acid, it was found that the same gas was evolved, which burned explosively in the air. This gas was:

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