Question

Which of the following reaction is reversible in nature?

• A. $2\text{Na (s)}+{\text{H}}_2\text{O (l)}\to 2\text{NaOH (aq)}+{\text{H}}_2\text{(g)}$
• B. ${\text{CH}}_4\text{(g)}+2{\text{O}}_2\text{(g)}\to {\text{CO}}_2\text{(g)}+{\text{2H}}_2\text{O (l)}$
• C. ${\text{BaCl}}_2\text{(aq)}+{\text{H}}_2{\text{SO}}_4\text{(aq)}\to {\text{BaSO}}_4\text{(s)}+\text{2HCl (aq)}$
• D. ${\text{NH}}_4\text{Cl (s)}\leftrightharpoons {\text{NH}}_3\text{(g)}+\text{HCl(g)}$

Answer 1

The correct option is D

${\text{NH}}_4\text{Cl (s)}\leftrightharpoons {\text{NH}}_3\text{(g)}+\text{HCl(g)}$

A reaction in which reactants give products and products can give back the reactants is known as a reversible reaction. Example of a reversible reaction is:

$N{H}_{4}Cl\left(s\right)\leftrightharpoons N{H}_3\left(g\right)+HCl\left(g\right)$

Reversible reactions are always represented by $\leftrightharpoons$

A reaction in which reactants give products and products cannot give back the reactants is known as an irreversible reaction. Example of an irreversible reaction are:

$C{H}_4\left(g\right)+2O_2\left(g\right)\to C{O}_2\left(g\right)+2H_{2}O\left(l\right)$

$2Na\left(s\right)+H_{2}O\left(l\right)\to 2NaOH\left(aq\right)+H_2\left(g\right)$

$BaC{l}_2\left(aq\right)+H_{2}S{O}_4\left(aq\right)\to BaS{O}_4\left(s\right)+2HCl\left(aq\right)$

Irreversible reactions are always represented by $\to$