Addition of conc. $H_{2} S O_{4}$ to water is:

an exothermic reaction.

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an endothermic reaction.

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a redox reaction.

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neutralisation reaction.

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Solution

The correct option is A an exothermic reaction.
Water is less dense than sulfuric acid so when acid is added to water it sinks down and this hydration reaction of sulfuric acid is highly exothermic in nature and very vigorous in nature.

$H_{2} S O_{4}$ + $H_{2} O$ $\to$ $H_{3} O^{+}$ + $H S O_{4}^{-}$

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