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Question
On addition to conc. \[\ce{H2SO4}\] to a chloride salt, colourless fumes are evolved but in the case of an iodide salt, violet flames come out. This is because ______.
Options
\[\ce{H2SO4}\] reduces \[\ce{HI}\] to \[\ce{I2}\]
\[\ce{HI}\] is of violet colour
\[\ce{HI}\] gets oxidised to \[\ce{I2}\]
\[\ce{HI}\] changes to \[\ce{HIO3}\]
Solution
On addition to conc. \[\ce{H2SO4}\] to a chloride salt, colourless fumes are evolved but in the case of an iodide salt, violet flames come out. This is because \[\ce{HI}\] gets oxidised to I2.
Explanation:
\[\ce{HI}\] formed during reaction is oxidized to \[\ce{I2}\] which is violet in colour.
\[\ce{2NaCl + H2SO4 -> Na2SO4 + 2HCl}\]
In case of iodine, the halogen acid obtained \[\ce{(HI)}\] is oxidized to free iodine.
\[\ce{2NaI + H2SO4 -> Na2SO4 + 2HI ->[H2SO4] 2H2O + SO2 + I2}\]
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