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On addition of conc. H(2)SO(4) to a chlo...

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

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)`

Text Solution

Verified by Experts

The correct Answer is:
C
Hydrogen iodide (HI) is more stronger oxidising agent than `H_(2)SO_(4)` . So , it reduces `H_(2)SO_(4)` to `SO_(2)` and itself oxidises to `I_(2)`. Is violet hence in adding conc. `H_(2)SO_(4)` to HI, it gets oxidised to `I_(2)`.
`H_(2)SO_(4)+2HItounderset(("Violet colour"))(SO_(2)+I_(2)+2H_(2)O)`
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Knowledge Check

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

    A
    `H_(2)SO_(4)` reduces Hl to `l_(2)`
    B
    Hl is of violet colour
    C
    Hl gets oxidised to `l_(2)`
    D
    Hl changes to `HlO_(3)`

  • On addition of con. H_(2)SO_(4) to a chloride salt, colourless fumes come out. This is because

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

  • Addition of conc. HNO_3 to conc. H_2 SO_4 gives

    A
    `SO_4^(2-)`
    B
    `SO_3`
    C
    `NO_3^(Ө)`
    D
    `NO_2^(oplus)`

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