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JEE Main & Advanced Chemistry The p-block Elements-II / p-ब्लॉक तत्व-II Question Bank Self Evaluation Test - The p-Block Elements (Group 13 and Group 14)

  • 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:

    A) hydrofluosilicic acid

    B) silica gel

    C) silicic acid

    D) calciumfluorosilicate

    Correct Answer: D

    Solution :

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


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