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Question

H2+Cl22HCl

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 reaction


Explanation 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.

H2(g)Hydrogen+Cl2(g)Chlorine2HCl(l)HydrochloricAcid

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: CaCO3(s)CalciumCarbonateCaO(s)Calciumoxide+CO2(g)Carbondioxide

(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.

Zn(s)Zinc+H2SO4(aq.)SulfuricacidZnSO4(aq)Zincsulfate+H2(g)Hydrogengas

(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.
NaCl(aq)SodiumChloride+AgNO3(aq)SilverNitrateAgCl(s)Silverchloride+NaNO3(aq.)SodiumNitrate

Hence, option(B) is correct.


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