Question

Which of the following acid is non-oxidizing acid?

• A. Conc. $H_{2}S{O}_4$
• B. Conc. $H_{3}P{O}_4$
• C. Conc. $HN{O}_3$
• D. None of these

Answer 1

Answer: (B)

Conc. $H_{3}P{O}_4$

Option (B) is correct.
$Conc.H_{3}P{O}_4$ is a non-oxidizing acid. Hydrochloric acid, hydroiodic acid, hydrobromic acid, hydrofluoric acid, phosphoric acid are all non-oxidizing acids.

An oxidizing acid is one that has the power and property to change the compound with which it interacts and is in itself then reduced.

Ex: $conc.HN{O}_3,conc.H_{2}S{O}_4$. With $HN{O}_3$, it can react in a manner that changes the oxidation state of the nitrogen.