Question

The reaction of formation of hydrogen chloride from hydrogen and chloride represents the following type of reaction.
A) Decomposition reaction.
B) Displacement reaction.
C) Combination reaction.
D) Double displacement reaction.

Answer 1

Hint: 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, \[{\rm{A}} + {\rm{B}} \to {\rm{AB}}\], 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 $\left( {{\rm{HCl}}} \right)$ in a chemical reaction are formed by the addition or combination of one molecule of ${{\rm{H}}_{\rm{2}}}$ and one molecule of ${\rm{C}}{{\rm{l}}_{\rm{2}}}$. Such a type of reaction is termed as a chemical combination reaction. The complete reaction is shown below.
${{\rm{H}}_2} + {\rm{C}}{{\rm{l}}_2} \to 2{\rm{HCl}}$
Hence, we can say that, ${\rm{Hydrogen}} + {\rm{Chlorine}} \to {\rm{Hydrogen}}\;{\rm{chloride}}$ is a chemical combination reaction.

Thus, the correct option is C.

Note: As we know that, the atoms of every reactant and product species are equal in a balanced chemical reaction. Combination reactions occur when a new substance is created by combining two or more than two substances in a chemical reaction.