JEE Main & Advanced Chemistry The p-block Elements-II Question Bank Halogen Family

  • question_answer A salt, which on heating with conc. \[{{H}_{2}}S{{O}_{4}}\] gives violet vapours, is [CPMT 1971]

    A) Iodide

    B) Nitrate

    C) Sulphate

    D) Bromide

    Correct Answer: A

    Solution :

      \[KI+\underset{\text{Conc}\text{.}}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,\,\xrightarrow{\Delta }\,KHS{{O}_{4}}+HI\] Conc.\[\underset{\begin{smallmatrix}  \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{              }\,\,\,\,\text{        Violet}\,\text{ } \\  \text{                                             }\,\,\,\,\,\,\,\,\text{vapour       } \end{smallmatrix}}{\mathop{{{H}_{2}}S{{O}_{4}}+2HI\,\to \,2{{H}_{2}}O+{{I}_{2}}+S{{O}_{2}}}}\,\uparrow \]

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