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JEE Main & Advanced Sample Paper JEE Main Sample Paper-21

  • question_answer
    Colour less salt\[(A)+dil.{{H}_{2}}S{{O}_{4}}\]  or \[C{{H}_{3}}COOH+KI\xrightarrow{{}}\]blue colour with starch.  can be

    A)  \[{{K}_{2}}S{{O}_{3}}\]                    

    B)  \[N{{a}_{2}}C{{O}_{3}}\]

    C)  \[N{{H}_{4}}N{{O}_{2}}\]                 

    D)  \[N{{H}_{4}}CI\]

    Correct Answer: C

    Solution :

    \[2NO_{2}^{-}+3I+4C{{H}_{3}}COOH\xrightarrow{\,}\]\[I_{3}^{-}\,+2NO\uparrow \,+4C{{H}_{3}}CO{{O}^{-}}\,+2{{H}_{2}}O\] \[I_{3}^{-}\,+\] starch blue colouration.


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