Which of the following is the most exothermic reaction?

{A g}^{+} (a q) + {C l}^{-} \to A g C l (a q)

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C_{5} H_{12} (s) + 8 O_{2} (g) \to 5 {C O}_{2} (g) + 6 H_{2} O (l)

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{N H}_{3} (s) + H_{2} O (s) ⇋ {N H}_{4}^{+} (s) + {O H}^{-} (s)

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H C_{2} H_{3} O_{2} (l) + {O H}^{-} (a q) \to H_{2} O (O) + C_{2} H_{3} O_{2}^{-} (a q)

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

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Solution

The correct option is B $C_{5} H_{12} (s) + 8 O_{2} (g) \to 5 {C O}_{2} (g) + 6 H_{2} O (l)$
Option B is the correct answer.
The reaction written in option B is a combustion reaction. It is combustion of Propane. Combustion reactions are exothermic in nature.
Thus, combustion of propane is an exothermic reaction and a lot of heat is generated, which causes more propane to combine with Oxygen.

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