CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2004

  • question_answer
    In the electrothermal process, the compound displaced by silica from calcium phosphate is:

    A)  calcium phosphide

    B)  phosphine

    C)  phosphorus

    D) ­ phosphorus pentoxide

    Correct Answer: D

    Solution :

    In electrothermal process, silica is heated with   calcium phosphate when phosphorus pentoxide is obtained. It is then reduced by coke in electric furnace to get white phosphorus. \[2C{{a}_{3}}{{(P{{O}_{4}})}_{2}}+6Si{{O}_{2}}\xrightarrow{\Delta }6CaSi{{O}_{3}}+{{P}_{4}}{{O}_{10}}\]                 \[{{P}_{4}}{{O}_{10}}+10C\xrightarrow{\Delta }{{P}_{4}}+10CO\]


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