Question

which one of the following is both oxidising and reducing agent? 1.H2SO4. 2.H3PO4. 3.HNO2. 4.HCIO4​

Answer 1

Answer:

B -part is correct answer

Answer 2

Answer:

HNO

2

acts as both oxidising and reducing agent as the oxidation number of N in nitrous acid is +3, the oxidation number can be either increased or decreased.

Nitrous acid oxidises hydrogen sulphide to sulphur:

H

2

S+2HNO

2

→2H

2

O+2NO+S

whereas oxidation state increases when reacted with KMnO

4

,Br

2

and nitrous acid acts as the reducing agent in this case.

Hence, the correct option is B