NEET Sample Paper NEET Sample Test Paper-9

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

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

    B)  \[{{K}_{3}}P{{O}_{4}}\]

    C)  \[KBr\]                        

    D)  \[KI\]

    Correct Answer: D

    Solution :

    \[2CuS{{O}_{4}}+4KI\xrightarrow{{}}2{{K}_{2}}S{{O}_{4}}+\underset{white\,\,ppt.}{\mathop{2CuI}}\,+\underset{\begin{smallmatrix}  Brown\,\,colour \\  in\,\,solution \end{smallmatrix}}{\mathop{{{I}_{2}}}}\,\]\[\underset{Hypo}{\mathop{2N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\,+{{I}_{2}}\xrightarrow{{}}\underset{sodium\,\,tetrathionate\,colourless}{\mathop{N{{a}_{2}}{{S}_{4}}{{O}_{6}}+2NaI}}\,\]

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