JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer White P reacts with caustic soda, the products are \[P{{H}_{3}}\] and \[Na{{H}_{2}}P{{O}_{2}}\]. This reaction is an example of [DCE 2003]

    A) Oxidation

    B) Reduction

    C) Disproportionation

    D) Neutralisation

    Correct Answer: C

    Solution :

    In this reaction, phosphorus is simultaneously oxidised to \[Na{{H}_{2}}P{{O}_{2}}\]and reduced to\[P{{H}_{3}}\]. Hence this reaction is an example of disproportionation. \[{{\overset{o}{\mathop{P}}\,}_{4}}+3NaOH+3{{H}_{2}}O\to 3Na{{H}_{2}}\overset{+1}{\mathop{P}}\,O_{2}^{{}}+\overset{-3}{\mathop{P}}\,H_{3}^{{}}\] 


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