JEE Main & Advanced Sample Paper JEE Main Sample Paper-5

  • question_answer
    A certain compound A when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound will be

    A)  \[{{K}_{3}}P{{O}_{4}}\]                

    B)  \[KBr\]

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

    D)  Kl

    Correct Answer: D

    Solution :

     \[CuS{{O}_{4}}+2Kl\xrightarrow[{}]{{}}Cu{{l}_{2}}+{{K}_{2}}S{{O}_{4}}\]\[2Cu{{l}_{2}}\xrightarrow[{}]{{}}\underset{White}{\mathop{C{{u}_{2}}{{l}_{2}}}}\,+\underset{Brown}{\mathop{{{l}_{2}}}}\,\]\[\underset{{}}{\mathop{{{l}_{2}}}}\,+2N{{a}_{2}}{{S}_{2}}{{O}_{3}}\xrightarrow[{}]{{}}N{{a}_{2}}{{S}_{4}}{{O}_{6}}+\underset{Colourless}{\mathop{2Nal}}\,\]


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