Question

Assertion : Given,\[{{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{3}}}\] is dibasic acid.
Reason : Two hydrogen atoms are directly attached to the P.
A.If both assertion and reason are true and reason is the correct explanation of assertion
B.If both assertion and reason are true but reason is not the correct explanation of assertion
C.If assertion is true but reason is false
D.If both assertion and reason are false

Answer 1

Hint: Any hydrogen-containing material capable of giving a proton (hydrogen ion) to another chemical is classified as an acid. A base is a molecule or ion that can take a hydrogen ion from an acid and receive it. Acidic compounds are characterised by a sour flavour. An acid is a molecule that can contribute an \[{H^ + }\] ion while also remaining energetically favourable after losing that ion. Blue litmus is known to become red when exposed to acids.

Complete answer:
The basicity of an acid is the quantity of hydrogen ions that one molecule of acid may generate. The amount of hydrogen ions that can be created from one molecule of an acid on complete dissociation is described as basicity, whereas the number of hydroxyl ions that can be formed from one molecule of a base on complete dissociation is defined as acidity.
\[\;{H_3}P{O_3}\] is also known as phosphoric acid or orthophosphorous acid. It belongs to the group of phosphorus oxygenic acids. Phosphorous acid is converted into phosphites, which are utilised as reduction agents. To be acidic, hydrogen must be bound to a highly electronegative atom. There are two POH bonds and one PH bond in it. As a result, its basicity is 2. It's connected to two oxygen cylinders here. As a result, \[\;{H_3}P{O_3}\] has a basicity of 2. Only two of the three H atoms in $H_3PO$ are connected by oxygen and are ionisable. Because third hydrogen is intimately linked to phosphorus, it cannot be ionised. As a result,\[\;{H_3}P{O_3}\] is a dibasic acid.

Hence option C is the correct answer.

Note:
The chemical with the formula \[\;{H_3}P{O_3}\] is phosphorus acid. This acid is diprotic (it easily ionises two protons), not triprotic as the formula may imply. Phosphorous acid is a chemical substance that is used to make other phosphorus compounds.