Lime water + sulphuric acid $\to$

Heat + Calcium sulphate

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Water + Heat

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Calcium sulphate + Water + Heat

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None of the above

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Solution

The correct option is C Calcium sulphate + Water + Heat
Lime water/calcium hydroxide $C a (O H)_{2}$ is a strong base and sulphuric acid $H_{2} S O_{4}$ is a strong acid as they undergo complete dissociation in solution.
When acid and base react with each other, the base neutralizes the acid, leading to the formation of salt and water.
This reaction is known as neutralization reaction and it is exothermic in nature (since heat is released due to formation of new bonds in the reaction).
Thus, more stronger the acid and the base, more amount of heat is released.
$C a (O H)_{2} + H_{2} S O_{4} \to C a S O_{4} + 2 H_{2} O + H e a t$ .
Hence, the correct answer is option (C).

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