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NEET Chemistry Analytical Chemistry Question Bank Self Evaluation Test - Analytical Chemistry

  • question_answer
    An aqueous solution of a salt X turns blood red on treatment with \[CN{{S}^{-}}\] and blue on treatment with\[{{K}_{4}}[Fe{{\left( CN \right)}_{6}}]\]. X also gives a positive chromyl chloride test. The salt X is:

    A) \[CuC{{l}_{2}}\]                      

    B) \[FeC{{l}_{3}}\]

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

    D) \[Fe{{(N{{O}_{3}})}_{3}}\]

    Correct Answer: B

    Solution :

    [b] \[F{{e}^{3+}}\], radical gives blood red with \[CN{{S}^{-}}\] \[F{{e}^{3+}}+3CN{{S}^{-}}\xrightarrow{{}}\underset{\begin{smallmatrix}  Ferric\text{ }sulphocyamde \\  \left( Blood\text{ }red\text{ }colouration \right) \end{smallmatrix}}{\mathop{Fe{{(CNS)}_{3}}}}\,\]             \[F{{e}^{3+}}\] gives blue colour on treatment with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] \[4F{{e}^{3+}}+3{{K}_{4}}\left[ Fe{{\left( CN \right)}_{6}} \right]\xrightarrow{{}}\] \[\underset{\begin{smallmatrix}  Ferricferrocyanide \\  \left( Prussian\text{ }blue \right) \end{smallmatrix}}{\mathop{12{{K}^{+}}+F{{e}_{4}}{{\left[ Fe{{\left( CN \right)}_{6}} \right]}_{3}}}}\,\] \[C{{l}^{-}}\] radical gives chromyl chloride test.


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