A) \[C{{l}^{-}}\]
B) \[{{I}^{-}}\]
C) \[B{{r}^{-}}\]
D) \[NO_{3}^{-}\]
Correct Answer: B
Solution :
Iodine vapours are violet \[\therefore \] the salt must contain \[{{I}^{-}}\]as \[KI+{{H}_{2}}S{{O}_{4}}\to KHS{{O}_{4}}+HI\] \[2HI+{{H}_{2}}S{{O}_{4}}\,\,\,\,\to \underset{\text{violet vapour}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{{{I}_{2}}+2{{H}_{2}}O+S{{O}_{2}}}}\,\]
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