Question

Classify the following reactions as combination, decomposition, single displacement or double
displacement reactions.

a. Reaction of hydrogen with chlorine to form hydrogen chloride

b. Reaction of aluminium with hydrochloric acid to form aluminium chloride and hydrogen gas
c. Formation of sodium and chlorine on passing an electric current through a solution of sodiumchloride

d. Reaction of silver nitrate with potassium chloride to form silver chloride and potassium nitrate

e. Formation of water and oxygen by the action of sunlight on hydrogen peroxide ​

Answer 1

Explanation:

A. We know that a chemical reaction is understood as a method in which chemical reagents called reactants with different compositions react together to give new chemicals, called products. In a general reaction, A+B→AB

, the addition of molecule A with molecule B results in the formation of one molecule of AB or in simple words, two reactants react to form a single product.

Complete step by step answer:

> Any chemical change is a chemical reaction that can be represented by a word equation in which full reactant and product names have been used. The other method of representation is chemical equations in which we use chemical formulae of all the involved species. There are different types of chemical reactions, which are combination reactions, decomposition reactions, displacement reactions, double displacement reactions and redox reactions.

Now, let’s understand about the chemical combination reaction.

> The chemical reaction in which two or more atoms or molecules of reactants react together to form a single molecule of product, is termed as the chemical combination reaction.

For example, in the given case, two molecules of hydrochloric acid (HCl) in a chemical reaction are formed by the addition or combination of one molecule of H2 and one molecule of Cl2. Such a type of reaction is termed as a chemical combination reaction. The complete reaction is shown below.

H2+Cl2→2HCl

Hence, we can say that, Hydrogen+Chlorine→Hydrogenchloride is a chemical combination reaction