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Question

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


A

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B

2

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C

3

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D

4

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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

H2+Cl2HCl

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

H2+Cl22HCl

This gives the required reaction


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