One molecule of hydrogen and one molecule of chlorine react to give __ molecule(s) of hydrochloric acid.

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Solution

The correct option is B
2

One molecule of hydrogen and one molecule of chlorine react to give 2 molecules of hydrochloric acid.

First, let us write the skeletal equation

$H_{2} + C l_{2} \to H C l$

$∵$ there are 2 atoms of both hydrogen and chlorine in the reactants side, multiply HCl by 2.

$H_{2} + C l_{2} \to 2 H C l$

This gives the required reaction

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