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  • A salt gives violet vapours when treated with conc. <img alt="\mathrm{H}_{2} \mathrm{SO}_{4}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7BH%7D_%7B2%7D%20%5Cmathrm%7BSO%7D_%7B4%

A salt gives violet vapours when treated with conc. \mathrm{H}_{2} \mathrm{SO}_{4}. It contains

Option: 1

\text{Cl}^{-}


Option: 2

\text{I}^{-}


Option: 3

\text{Br}^{-}


Option: 4

\text{NO}_{3}^{-}


Answers (1)

best_answer

Iodine vapours are violet. Thus, the salt must contain Iodide \mathrm{(I^-)} ion.

The reaction is given below

\mathrm{2 NaI +2 H _{2} SO _{4} \longrightarrow Na _{2} SO _{4}+ SO _{2}+2 H _{2} O + \underset{\text{Violet Vapors}}{I _{2}}}

Hence, the correct answer is Option (2)

Posted by

jitender.kumar

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