On addition of conc. `H_(2)SO_(4)` to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

Options

A. `H_(2)SO_(4)` reduces HI to `I_(2)`
B. HI is of violet colour
C. HI gets oxidised to `I_(2)`
D. HI changes to `HIO_(3)`

Answer

C

Explanation

Hydrogen iodide(HI) is more stronger oxidizing agent than `H_(2)SO_(4)` So, it reduces `H_(2)SO_(4) "to" SO_(2)` and itself oxidises to `I_(2)` Colour of `I_(2)` is violet hence on adding conc. `H_(2)SO_(4)` to HI, it gets oxidised to `I_(2)`
`H_(2)SO_(4)+2HI to SO_(2)+underset("Voilet colour")I_(2)+2H_(2)O`