Question

why HI cant be prepared fromthe action of conc.H2So4 on NaI?

Answer 1

Answer:

HI cannot be prepared by the reaction of KI with concentrated H2SO4 because HI is converted into I2 on reaction with H2SO4.

Answer 2

2

SO

4

on KI because H

2

SO

4

on KI because H

2

SO

4

is an oxidising agent and HI is strong reducing agent.

HI reduces sulphuric acid to sulphur dioxide and itself is oxidised to iodine.

KI+H

2

SO

4

→KHSO

4

+HI

H

2

SO

4

+2HI→SO

2

+I

2

+2H

2