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KVPY Sample Paper KVPY Stream-SX Model Paper-4

  • question_answer
    A gaseous substance dissolves in water giving a pale blue solution which decolorises \[KMn{{O}_{4}}\]and oxidises \[KI\]to \[{{I}_{2}}.\]Gaseous substance is

    A) \[{{N}_{2}}{{O}_{5}}\]                      

    B) \[N{{H}_{3}}\]

    C) \[{{N}_{2}}{{O}_{3}}\]          

    D) \[HN{{O}_{3}}\]

    Correct Answer: C

    Solution :

    [c]
    \[{{N}_{2}}{{O}_{3}}\] dissolves in water giving a pale blue solution of \[HN{{O}_{2}}\] which decolorises \[KMn{{O}_{4}}\]and oxidises KI to \[{{I}_{2}}.\]
    \[{{N}_{2}}{{O}_{3}}+{{H}_{2}}O\xrightarrow{{}}\underset{\text{Pale}\,\text{blue}}{\mathop{HN{{O}_{2}}}}\,\]
    \[HN{{O}_{2}}\]is a reducing agent \[MnO_{4}^{-}\xrightarrow{HN{{O}_{2}}}M{{n}^{2+}}\]
    \[HN{{O}_{2}}\]is also an oxidising agent \[{{I}^{-}}\xrightarrow{HN{{O}_{2}}}{{I}_{2}}\]


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