Test Index

JAMB Chemistry 2019 Paper

Question : 13

Total: 80

Solution:

Concept:

Chlorine water decomposes in sunlight to form hydrochloric acid and oxygen gas.

Explanation:

Chlorine reacts reversibly with water:

\mathrm{Cl}_2 + \mathrm{H}_2\mathrm{O} \rightleftharpoons \mathrm{HCl} + \mathrm{HOCl}

In bright sunlight,

\mathrm{HOCl}

decomposes:

2\mathrm{HOCl} \rightarrow 2\mathrm{HCl} + \mathrm{O}_2

Overall:

2\mathrm{Cl}_2 + 2\mathrm{H}_2\mathrm{O} \rightarrow 4\mathrm{HCl} + \mathrm{O}_2

Thus, the products are

\mathrm{HCl}_{(aq)}

and

\mathrm{O}_2

Answer:

\mathrm{HCl}_{(aq)}

and

\mathrm{O}_2

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