JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Wet Test for Acid Radical

  • question_answer
    Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produces purple colour ion due to the formation of [IIT 1995]

    A) \[Na\left[ Fe{{\left( {{H}_{2}}O \right)}_{5}}NOS \right]\]

    B) \[N{{a}_{2}}\left[ Fe{{\left( {{H}_{2}}O \right)}_{5}}NOS \right]\]

    C) \[N{{a}_{3}}\left[ Fe{{\left( CN \right)}_{5}}NOS \right]\]

    D) \[N{{a}_{4}}\left[ Fe{{\left( CN \right)}_{5}}NOS \right]\]

    Correct Answer: D

    Solution :

     \[N{{a}_{4}}\left[ Fe{{(CN)}_{5}}NO \right]\ +\ {{S}^{2-}}\ \to \underset{\begin{smallmatrix}  \text{Sodium thio-nitroprusside} \\  \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{(violet)} \end{smallmatrix}}{\mathop{\ N{{a}_{4}}\left[ Fe{{(CN)}_{5}}NOS \right]\,\,\,}}\,\]


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