How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.

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Solution

An aqueous solution of ammonium chloride is treated with sodium nitrite.

NO and HNO₃ are produced in small amounts. These are impurities that can be removed on passing nitrogen gas through aqueous sulphuric acid, containing potassium dichromate.

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How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.

(a) Name the chemicals required for the preparation of carbon dioxide in the laboratory.

(b) How will you collect the gas?

(d) Why is sulphuric acid not used for the preparation of carbon dioxide in the laboratory?

800^{o} C

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