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BHU PMT BHU PMT (Screening) Solved Paper-2009

  • question_answer
    An element forms a solid oxide which when dissolved in water, forms an acidic solution. The element is

    A)  neon                                   

    B)  sodium

    C)  phosphorus     

    D)  sulphur

    Correct Answer: C

    Solution :

                     Phosphorus pentoxide\[({{P}_{2}}{{O}_{5}})\]is a white solid. It forms an acidic solution with water. \[{{P}_{2}}{{O}_{5}}+3{{H}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix}  orthophosphoric \\  \,\,\,\,\,\,\,\,\,\,\,acid \end{smallmatrix}}{\mathop{2{{H}_{3}}P{{O}_{4}}}}\,\]


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