One molecule of an 'ic' acid of a nonmetal having 5 electrons in valence shell reacts with a molecule of base to form a salt 'X'. The base corresponds to the metal with one electron in valence shell. If the salt so formed can react with the same base in 1 : 2 ratio, predict the formula of the salt 'X'.

Options

A. `K_(2)SO_(4)`
B. `Na_(2)HPO_(4)`
C. `KH_(2)PO_(4)`
D. `Na_(3)PO_(4)`

Answer

C

Explanation

The non-metal with 5 valence electrons is phosphorus and .ic acid of phosphorus is phosphoric acid. Metal with one electron in valence shell forms a base with the formula MOH. Since the salt can react with two molecules of base, the salt contains two replaceable hydrogen molecules. The formula of salt X is `KH_(2)PO_(4)`.