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Which of the following is an instantaneous reaction?

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$HCl + NaOH \to NaCl + H_{2} O$

$2 H_{2} + O_{2} \overset{Pt}{\to} 2 H_{2} O$

$2 NO + O_{2} \to 2 {NO}_{2}$

$H_{2} + {Cl}_{2} \to 2 HCl$

answer is A.

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Detailed Solution

Ionic reactions are instantaneous reactions, they do not involve bond rearrangements;

Neutralization reactions are ionic reactions;

Options 2,3,4 are molecular reactions;

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