Sugar's colour turns ________ on addition of conc. $H_{2} S O_{4}$ .

black

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blue

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brown

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colour less

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Solution

The correct option is A black
When table sugar is mixed with sulphuric acid the sugar changes from white to dark brown and then to black as carbon is formed. The carbon will smell strongly of caramel due to the heat generated.
$C_{12} H_{22} O_{11} + s u l p h u r i c a c i d \to 12 C (b l a c k g r a p h i t i c f o a m) + 11 H_{2} O + w a t e r m i x t u r e$

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