Question

Which of the following reaction is double displacement reaction?

• A. ${\text{FeCl}}_3+3\text{NaOH}\to {\text{Fe(OH)}}_3+3\text{NaCl}$
• B. $\text{Zn}+{\text{H}}_2{\text{SO}}_4\to \text{Zn}{\text{SO}}_4+{\text{H}}_2$
• C. $2\text{CO}+{\text{O}}_2\to 2{\text{CO}}_2$
• D. ${\text{N}}_2+{\text{O}}_2\to 2\text{NO}$

Answer 1

The correct option is A ${\text{FeCl}}_3+3\text{NaOH}\to {\text{Fe(OH)}}_3+3\text{NaCl}$

A double displacement reaction involves exchange of ions between the reactants in order to form the products.

In the reaction between ferric chloride and sodium hydroxide, there is exchange of ${\text{Cl}}^{-}$ and ${\text{OH}}^{-}$ ions between the reactants to form ferric hydroxide and sodium chloride. So, it is a double displacement reaction.