What happens when we add dilute sulphuric acid to lime water? Does the reaction mixture become hot or cool?

When dilute sulphuric acid is added to lime water, calcium sulphate is formed. Also, heat is released in the process and so the reaction mixture becomes hot. Following is the chemical equation showing the reaction

 H2SO4 + Ca(OH)2 → CaSO4 + H2

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hoooottttttt !!!!!!

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how ..........can u explain???????

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