JEE Main & Advanced JEE Main Paper (Held On 22 April 2013)

  • question_answer Which of the following statements is incorrect?     JEE Main  Online Paper (Held On 22 April 2013)

    A) \[\operatorname{F}{{\operatorname{e}}^{2}}^{+}\]ion also gives blood  red  colour  with \[{{\operatorname{SCN}}^{-}}\]ion    

    B)  \[F{{e}^{3+}}\]ion given blood red colour with \[SC{{N}^{-}}\] ion.

    C)  On Passing \[{{H}_{2}}S\] into \[N{{a}_{2}}Zn{{O}_{2}}\] solution, a white ppt of \[ZnS\] is formed

    D)  Cupric ion react with excess of ammonia solution to give deep blue colour of \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] ion.

    Correct Answer: A

    Solution :

     Only \[\text{F}{{\text{e}}^{\text{3+}}}\]ions give blood red colouration with\[\text{SC}{{\text{N}}^{-}}\] ions. \[F{{e}^{3+}}+SC{{N}^{-}}\xrightarrow{{}}\underset{(dark\,red)}{\mathop{{{[Fe(SCN)]}^{2+}}}}\,\]

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