question_answer

For \[{{H}_{3}}P{{O}_{3}}\]and \[{{H}_{3}}P{{O}_{4}},\] the correct choice is:

A) \[{{H}_{3}}P{{O}_{3}}\] is stronger acid than\[{{H}_{3}}P{{O}_{4}}\]

B) \[{{H}_{3}}P{{O}_{3}}\] is dibasic and reducing.

C) \[{{H}_{3}}P{{O}_{4}}\] tribasic and reducing

D) [a] and [b] both

Correct Answer: D

Solution :

Strength of phosphorus oxy acid depends upon the number of OH groups per\[P=O\]group. It is the \[P=O\]group which induces polarisation and helps in the release of proton from-OH group. \[{{H}_{3}}P{{O}_{3}}>{{H}_{3}}{{P}_{4}}\]