Name the compound represented by the chemical formula $K_{2} {S O}_{4}$ .

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Solution

$K_{2} {S O}_{4}$ is composed of potassium ion ( $K^{+}$ ) and sulphate ion ( ${S O}_{4}^{2 -}$ ).
The valency of $K^{+}$ ion is 1 and that of ${S O}_{4}^{2 -}$ ion is 2.

Thus, on applying criss-cross method,

Symbol K ${S O}_{4}$

Valency 1 2

the chemical formula will be $K_{2} {S O}_{4}$ and the chemical name will be potassium sulphate.

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