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Concentrated H(2)SO(4) is added to can...

Concentrated `H_(2)SO_(4)` is added to cane sugar .

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Concentrated H_(2)SO_(4) is added to each of the five test tubes containing (i) NaBr, (ii) sugar, (iii) sulphur powder, (iv) KCl and (v) copper turnings. The test tubes are then heated. Identify in which of the test tubes the following changes will be observed. The observations are: disappearance of yellow powder along with liberation of a pungent colourless gas. Support your answer with the help of a chemical equation in this case.

Concentrated H_(2)SO_(4) is added to each of the five test tubes containing (i) NaBr, (ii) sugar, (iii) sulphur powder, (iv) KCl and (v) copper turnings. The test tubes are then heated. Identify in which of the test tubes the following changes will be observed. The observations are: formation of a black substance. Support your answer with the help of a chemical equation in this case.

Concentrated H_(2)SO_(4) is added to each of the five test tubes containing (i) NaBr, (ii) sugar, (iii) sulphur powder, (iv) KCl and (v) copper turnings. The test tubes are then heated. Identify in which of the test tubes the following changes will be observed. The observations are: formation of a brown substance which on dilution becomes blue. Support your answer with the help of a chemical equation in this case.

Why does sugar turn black when concentrated H_2SO_4 is added to it?