On addition of conc. $H_2SO_4$ to a chloride salt,colourless fumes are evolved,but in the case of an iodide salt,violet fumes are observed. This is because:
- A$H_2SO_4$ reduces $HI$ to $I_2$
- B$HI$ is of violet colour
- C$HI$ gets oxidised to $I_2$
- D$HI$ changes to $HIO_3$
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