Question

The valency of hydrogen phosphate radical is _________.

Answer 1

Number of ions lost or gained by an atom or compound is called its valency.

Atoms or compounds having valency of one, two or three are called univalent, divalent or trivalent respectively.

Hydrogen phosphate:- ${HP{O}_4}^{-2}$

It has overall $-2$ charge.

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Two electrons of oxygen atoms forms bond with other atom. Hence, its valency is $2$.