Question

# ${\mathrm{H}}_{2}+{\mathrm{Cl}}_{2}\to 2\mathrm{HCl}$ The reaction is an example of which of the following reactions?

A

Decomposition reaction

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B

Combination reaction

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C

Double Displacement reaction

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D

Displacement reaction

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Solution

## The correct option is B Combination reactionExplanation of Correct option(B) Addition/Combination Reactions: It is a union of two or more substances to form a new substance. It may be brought about by the application of heat, light, electricity, or pressure.$\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_{2}\left(\mathrm{g}\right)}+\underset{\mathrm{Chlorine}}{{\mathrm{Cl}}_{2}\left(\mathrm{g}\right)}\to \underset{\mathrm{Hydrochloric}\mathrm{Acid}}{2\mathrm{HCl}\left(\mathrm{l}\right)}$In this reaction, two elements are combined to form a single product. This is a combination reaction. Explanation of Incorrect option(A) Decomposition Reaction: It is the breaking up of a substance into simpler compounds and it may be brought about by the application of heat, light, electricity etc.A decomposition reaction brought by heat is known as thermal decomposition.Example: $\underset{\mathrm{Calcium}\mathrm{Carbonate}}{{\mathrm{CaCO}}_{3}\left(\mathrm{s}\right)}\to \underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_{2}\left(\mathrm{g}\right)}$(D) Displacement Reactions: It involves the displacement of one of the constituents of a compound by another substance and may be regarded as a displacement reaction.When zinc reacts with sulfuric acid, hydrogen gas is liberated and zinc sulfate is formed.$\underset{\mathrm{Zinc}}{\mathrm{Zn}\left(\mathrm{s}\right)}+\underset{\mathrm{Sulfuric}\mathrm{acid}}{{\mathrm{H}}_{2}{\mathrm{SO}}_{4}\left(\mathrm{aq}.\right)}\to \underset{\mathrm{Zinc}\mathrm{sulfate}}{{\mathrm{ZnSO}}_{4}\left(\mathrm{aq}\right)}+\underset{\mathrm{Hydrogen}\mathrm{gas}}{{\mathrm{H}}_{2}\left(\mathrm{g}\right)}$(C) Double Displacement: It is a mutual exchange of the radicals of two compounds taking part in the reaction and results in the formation of two new compounds.$\underset{\mathrm{Sodium}\mathrm{Chloride}}{\mathrm{NaCl}\left(\mathrm{aq}\right)}+\underset{\mathrm{Silver}\mathrm{Nitrate}}{{\mathrm{AgNO}}_{3}\left(\mathrm{aq}\right)}\to \underset{\mathrm{Silver}\mathrm{chloride}}{\mathrm{AgCl}\left(\mathrm{s}\right)}+\underset{\mathrm{Sodium}\mathrm{Nitrate}}{{\mathrm{NaNO}}_{3}\left(\mathrm{aq}.\right)}$Hence, option(B) is correct.

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