Question

In which of the following reaction the physical state of the reactants or the product is not correctly represented?

• A. ${\text{N}}_2\text{(g)}+3{\text{H}}_2\text{(g)}\leftrightharpoons 2{\text{NH}}_3\text{(g)}$
• B. ${\text{SO}}_2\text{(g)}+{\text{Cl}}_2\text{(g)}\leftrightharpoons {\text{SO}}_2\text{(g)}$
• C. $\text{Zn (s)}+\text{HCl (aq)}\leftrightharpoons {\text{ZnCl}}_2\text{(aq)}+{\text{H}}_2\text{(g)}$
• D. ${\text{NH}}_3\text{(s)}+\text{HCl (aq)}\leftrightharpoons {\text{NH}}_4\text{Cl (s)}$

Answer 1

The correct option is D

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

While writing a chemical equation letter are used in brackets or subscripts next to the chemical formulae to specify the physical state of the reactants and the products.

- s is for solids

- l is for liquids

- g for gas

- aq is aqueous solution

The reaction in which the physical state of the reactants or the product is not correctly represented is:

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

This is because ammonia $\text{(}{NH}_3)$ is a gas.