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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    A dark brown solid \[X\]reacts with\[N{{H}_{3}}\]to form a mild explosive which decomposes to give a violet coloured gas. \[X\]also reacts with \[{{H}_{2}}\] to give an acid\[Y\cdot Y\]can also be prepared by heating its salt with\[{{H}_{3}}P{{O}_{4}}\,.\]\[X\]and\[Y\]are

    A)  \[C{{l}_{2}},HCl\]                            

    B)  \[S{{O}_{2}},{{H}_{2}}S{{O}_{4}}\]

    C)  \[B{{r}_{2}},HBr\]                           

    D)  \[{{I}_{2}},HI\]

    Correct Answer: D

    Solution :

              \[X={{I}_{2}},\] \[Y=HF\] \[3{{I}_{2}}+2N{{H}_{3}}\xrightarrow{{}}\underset{(explosive)}{\mathop{N{{H}_{3}}\cdot N{{I}_{3}}}}\,\] \[8N{{I}_{3}}\cdot N{{H}_{3}}\xrightarrow{{}}5{{N}_{2}}+{{I}_{2}}+6N{{H}_{4}}I\] \[{{I}_{2}}+{{H}_{2}}\xrightarrow{{}}\underset{Y}{\mathop{2HI}}\,\] \[3NaI+{{H}_{3}}P{{O}_{4}}\xrightarrow{\Delta }N{{a}_{3}}P{{O}_{4}}+3HI\]


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