Question

Identify the type reaction from the following.
 $ {{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}{\text{(aq)}}\,\, \to \,\,{{\text{H}}_{\text{2}}}{\text{O}}\,\left( {\text{l}} \right)\,\,{\text{ + }}\,\,{\text{C}}{{\text{O}}_2}\left( {\text{g}} \right) $
(A) Combustion reaction
(B) Decomposition reaction
(C) Addition reaction
(D) Substitution reaction

Answer 1

Hint :A chemical reaction occurs when one or more substances, referred to as reactants, are converted into one or more different substances, referred to as products. The constituent atoms of the reactants are rearranged in a chemical reaction, resulting in the formation of various substances as products.

Complete Step By Step Answer:
(A) A substance reacts with oxygen from the air in a combustion reaction. Combustion reactions occur at high temperatures and release energy in the form of light and heat into the environment.
In the above reaction there is no involvement of oxygen. Hence, it is not a Combustion reaction.
(B) A decomposition reaction occurs when a complex material is broken down into two or more simpler substances. A source of energy, such as heat, light, or electricity, is required for most decomposition reactions.
In the given reaction, carbonic acid decomposes into water and carbon dioxide. As a result, this is an illustration of a decomposition reaction.
(C) When two or more reactants combine to form a mixture without losing any of the reactants' atoms, the reaction is called an addition reaction.
In the given reaction there are no combinations of two or more reactants. Hence, it is not an additional reaction.
(D) A substitution reaction is a chemical reaction that involves the replacement of one functional group in a chemical compound with another functional group.
The given reaction does not involve replacement of one functional group in a chemical compound with another functional group. Hence, it is not a substitution reaction.
So, the given reaction is a decomposition reaction.
Hence, the correct option is (B).

Note :
The extraction of metals from their ores is one of the most common uses of decomposition reactions. Zinc, for example, can be extracted from calamine via a decomposition reaction. Sodium can also be derived from sodium chloride in a similar way.