What do you observe when sugar crystals are added to hard glass test tube containing conc. sulphuric acid?

Carbon dioxide gas is released.

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Oxygen gas is released.

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A black spongy mass of carbon is obtained.

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Carbon monoxide gas is released.

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Solution

The correct option is C
A black spongy mass of carbon is obtained.

Sugar reacts immediately with concentrated sulphuric acid to give a black spongy mass of carbon which rises up. Steam is given off and the whole mass gets heated due to an exothermic reaction. They are said to get charred.

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Similar questions

(a) Name the acid formed when sulphur dioxide dissolves in water.

(b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.

What do you observe when carbon dioxide gas is passed through lime water?

What would you observe in the following case:
Sugar crystals are added to hard glass test tube containing concentrated sulphuric acid.

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