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JEE Main & Advanced JEE Main Paper (Held On 9 April 2014)

  • question_answer
    The gas evolved on heating \[Ca{{F}_{2}}\]and \[Si{{O}_{2}}\] with concentrated\[{{H}_{2}}S{{O}_{4}},\]on hydrolysis gives a white gelatinous precipitate. The precipitate is:   [JEE Main Online Paper ( Held On 09 Apirl  2014  )

    A) Hydro fluosilicic acid

    B) silica gel

    C) silicic acid

    D) calcium fluorosilicate

    Correct Answer: D

    Solution :

    \[2Ca{{F}_{2}}+Si{{O}_{2}}+{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{{}}Si{{F}_{4}}+{{H}_{2}}O+CaS{{o}_{4}}\]\[\xrightarrow[{}]{hydrolysis}CaSi{{F}_{6}}\]


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