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

  • question_answer
    For detection of sulphur in an organic compound sodium nitroprusside is added to the sodium extract. A violet colour is obtained due to formation of

    A) \[Fe{{\left( CN \right)}_{2}}\]

    B) \[{{K}_{3}}Fe{{\left( CN \right)}_{5}}NS\]

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

    D) \[N{{a}_{4}}Fe{{\left( CN \right)}_{6}}\]

    Correct Answer: C

    Solution :

    [c] \[\underset{Sodium\text{ }nitroprusside}{\mathop{N{{a}_{2}}S+N{{a}_{2}}[Fe{{(CN)}_{5}}NO]\xrightarrow{{}}}}\,\] \[\underset{Sodium\text{ }thionitroprusside}{\mathop{N{{a}_{4}}\left[ Fe{{\left( CN \right)}_{5}}NOS \right]}}\,\]


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