When conc. $H_{2} S O_{4}$ comes in contact with sugar, it becomes black due to ____________________.

hydrolysis

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hydration

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decolourisation

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dehydration

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Solution

The correct option is D dehydration
The sugar, a carbohydrate such as $C_{6} H_{12} O_{8}$ , is mixed with the sulfuric acid, $H_{2} S O_{4}$ . The sulfuric acid dehydrates the carbohydrate removing water and leaving behind carbon. The hot steam creates bubbles in the carbon making a carbon foam.

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