Name the compound represented by the chemical formula \({K}_{2}{SO}_{4}\).

\({K}_{2}{SO}_{4}\) is composed of potassium ion (\({K}^{+}\)) and sulphate ion (\({SO}_{4}^{2-}\)).
The valency of \({K}^{+}\) ion is 1 and that of \({SO}_{4}^{2-}\) ion is 2.

Thus, on applying criss-cross method,

Symbol	K	\({SO}_{4}\)
Valency	1	2

the chemical formula will be \({K}_{2}{SO}_{4}\) and the chemical name will be potassium sulphate.