NEET Sample Paper NEET Sample Test Paper-90

The pair in which phosphorous atoms have a formal oxidation state of +3 is:

A) Orthophosphorous and hypophosphoric acids

B) Pyrophosphorous and pyrophosphoric acids

C) Orthophosphorous and pyrophosphorous acids

D) Pyrophosphorous and hypophosphoric acids

Correct Answer: C

Solution :

[c] Phosphorus acid contain P in +3 oxidation state.

Acid	Formula	Oxidation state of Phosphorus
Pyrophosphorus acid	\[{{H}_{4}}{{P}_{2}}{{O}_{5}}\]	+3
Pyrophosphoric acid	\[{{H}_{4}}{{P}_{2}}{{O}_{7}}\]	+5
Orthophosphorus acid	\[{{H}_{3}}P{{O}_{3}}\]	+3
Hypophosphoric acid	\[{{H}_{4}}{{P}_{2}}{{O}_{6}}\]	+4