What is the basicity of ortho phosphorous acid?

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None of the above

answer is A.

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Detailed Solution

Concept- Concept- Basicity of an acid is determined as the number of hydrogens present that are replaceable. Ortho phosphorous acid has a molecular formula

and is a strong reducing agent. In its structure two hydroxyl groups are present.
When treated with a base, two hydrogens from these hydroxyl groups can be removed as protons. Thus, phosphorous acid has basicity, two. Phosphorous acid is another name for orthophosphorous acid. Due to their ease of oxidation into phosphoric acid and phosphate salts, it is utilised as a reducing agent in chemical analysis. It is a crystalline, colourless material.
Basicity of an acid is determined as the number of hydrogens present that are replaceable. In its structure two hydroxyl groups are present. Consider the figure given below-
Question Image

When treated with a base, two hydrogens from these hydroxyl groups can be removed as protons. Thus phosphorus acid has basicity, two.
Hence, the correct answer is option 1.

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