Sulphuric acid is considered as the king of chemicals. The prosperity of any country is measured by the amount of sulphuric acid it consumes. Sulphuric acid is, thus, a substance of very great commercial importance as it used practically ine every important industry. This is due to the following properties of sulphuric acid :
(a) acidic nature
(b) oxidising nature
(c) dehydrating nature
(d) sulphonation.
Concentrated `H_2 SO_4` cannot be used to prepare `HBr` or `HI` from `KBr` or `KI` because it.

Options

A. Its reaction with Kl is very slow
B. It oxidises HI to iodine
C. It disproportionates HI
D. It reduces HI

Answer

B

Explanation

`H_2SO_4` is stonger oxidising agent and HI is stonger reducing agent. So `H_2SO_4` oxidises HI to `l_2` and is itself reduced to `SO_2`
`Nal+H_2SO_4toNaHSO_4+HI`
`HI+H_2SO_4 to I_2 + SO_2 + 2H_2O`