Question

Name the type of following chemical reaction:
$2{{H}_{2}}{{O}_{2}}\to 2{{H}_{2}}O+{{O}_{2}}$
(A) Displacement
(B) Combination
(C) Synthesis
(D) Decomposition

Answer 1

Hint: There are five basic types of chemical reactions, which will be useful for predicting the products of an unknown reaction. The five basic types of chemical reactions are combination, decomposition, single-replacement, double displacement, and combustion reactions. This classification allows us to analyze the reactants and products of a given reaction.

Complete step by step solution:
The five types of chemical reactions are:
(1) Combination reactions
(2) single-replacement reaction
(3) double displacement reaction
(4) Combustion reaction
(5) Decomposition reaction
Combination reactions: the reaction in which two or more substances combine to form a new single substance is known as combination reactions. These reactions are also called synthesis reactions. For example, solid sodium combines with chlorine gas to form solid sodium chloride as a product.
$2Na(s)+C{{l}_{2}}(g)\to 2NaCl(s)$
Single-replacement reactions: in which reaction one element replaces a similar element in a compound is known as a single-replacement reaction. This type of reaction is also called a single-displacement reaction.
For example, when a strip of magnesium metal is placed in an aqueous solution of Copper(II) nitrate, which replaces copper because Mg is more reactive than copper.
$Mg(s)+Cu{{(N{{O}_{3}})}_{2}}(aq)\to Mg{{(N{{O}_{3}})}_{2}}(aq)+Cu(s)$
Double displacement reaction: the reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.
For example: $2KI(aq)+Pb{{(N{{O}_{3}})}_{2}}\to 2KN{{O}_{3}}(aq)+Pb{{I}_{2}}(s)$
Combustion reactions: a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. These reactions must involve ${{O}_{2}}$ as one reactant.
For example, the combustion of hydrogen gas produces water vapor, the reaction as follows:
$2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(g)$
Decomposition reactions: a reaction in which a compound breaks down into two or simpler substances. For example, $2{{H}_{2}}{{O}_{2}}\to 2{{H}_{2}}O+{{O}_{2}}$
The decomposition of hydrogen peroxide into water and oxygen gas.
Hence, the given reaction is a type of decomposition reaction.

So, the correct answer is option D.

Note: The elementary type of reaction is the smallest division in which a chemical reaction can be decomposed without intermediate products. Many elementary reactions occur in parallel or sequentially with individual elementary reactions known as reaction mechanisms.