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Question: With excess of water, both \({P_2}{O_5}\) and \(PC{l_5}\) are: a.) \({H_3}P{O_3}\) b.) \({H_3}P{...

With excess of water, both P2O5{P_2}{O_5} and PCl5PC{l_5} are:
a.) H3PO3{H_3}P{O_3}
b.) H3PO2{H_3}P{O_2}
c.) H3PO4{H_3}P{O_4}
d.) H4P2O7{H_4}{P_2}{O_7}

Explanation

Solution

Hint: To solve this question, we will see the chemical reaction of P2O5{P_2}{O_5} and PCl5PC{l_5} with excess of water. The phosphorus pentoxide is a white crystalline solid and it is a potent dehydrating agent. The phosphorus pentachloride is a colorless and moisture sensitive solid.

Complete step by step solution: Now we will see the reaction of P2O5{P_2}{O_5} with the excess of water. When peroxide react with excess water, the product formed is orthophosphoric acid
P2O5+3H2O→2H3PO4{P_2}{O_5} + 3{H_2}O\xrightarrow{{}}2{H_3}P{O_4}
While the reaction of pentachloride with water gives phosphorus pentoxide and if excess water is provided the product formed is orthophosphoric acid.
PCl5+4H2O→H3PO4+5HClPC{l_5} + 4{H_2}O\xrightarrow{{}}{H_3}P{O_4} + 5HCl

Hence, the correct option is C.

Additional Information- acidic hydrogen- the necessary condition for a hydrogen atom to be acidic is that it must be connected to the electronegative atoms like oxygen or fluorine.
In case of orthophosphoric acid, we will see a number of hydrogen atoms connected to the oxygen for calculating its basicity.

{}&{\begin{array}{*{20}{c}} O \\\ {||} \end{array}}&{} \\\ {H - O - }&{P - }&{O - H} \\\ {}&{\begin{array}{*{20}{c}} | \\\ H \end{array}}&{} \end{array}$$ The above compound is the orthophosphorous acid. The number of H atoms bonded to the oxygen atoms in the above compound is equal to 2. _Therefore, the basicity of the orthophosphorous acid is 2._ Note: The orthophosphorous acid is also known as phosphorous acid. It is used as a reducing agent in the chemical analysis because they are easily oxidized to phosphoric acid and phosphate salts. It is a colourless and crystalline substance. It is one of the oxyacids of the phosphorus and the other oxyacids of the phosphorus are phosphoric acid and the basicity of this acid is 3 because it contains 3 acidic hydrogen atoms. The chemical formula for orthophosphoric acid is ${H_3}P{O_4}$