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Sucrose

Sugar turns b...

Question

Sugar turns black on addition of conc. $H_{2} S O_{4}$ . Why?

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Solution

The sulfuric acid is dehydrating agent and it dehydrates the carbohydrate sugar, removing the water and heating it into steam leaving behind a carbon foam. That is why it looks black.
$C_{12} H_{12} O_{11} H_{2} {S O}_{4} - --- \to 11 H_{2} O + 12 C$

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