Which one of the reaction is an exothermic reaction

C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

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N_{2} g + O_{2} \to 2 N O (g)

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2 H g O (s) \to 2 H g (s) + O_{2} (g)

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None of these

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Solution

The correct option is A $C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
$C a C O_{3} (s) ⟶ C a O (s) + C O_{2} (g)$ $Δ H = n e g a t i v e$
This reaction is exothermic reaction $Δ H = n e g a t i v e$ for the reaction. Heat is evolved in the reaction. $C a O$ (Quicklime) and $C O_{2}$ gas comes out of the reaction vessel.

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