NEET Chemistry NEET PYQ-Oxygen Family

  • question_answer
    Sulphur trioxide can be obtained by which of the following reaction       [AIPMT (S) 2012]

    A) \[\text{CaS}{{\text{O}}_{\text{4}}}\text{+}\,\text{C}\xrightarrow[{}]{\Delta }\]

    B) \[\text{F}{{\text{e}}_{\text{2}}}{{\text{(S}{{\text{O}}_{\text{4}}}\text{)}}_{\text{3}}}\xrightarrow[{}]{\text{ }\!\!\Delta\!\!\text{ }}\]

    C) \[\text{S}\,\text{+}\,{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\xrightarrow[{}]{\text{ }\!\!\Delta\!\!\text{ }}\]

    D) \[\,{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}+\text{PC}{{\text{l}}_{\text{5}}}\xrightarrow[{}]{\text{ }\!\!\Delta\!\!\text{ }}\]

    Correct Answer: B

    Solution :

    [b] \[CaS{{O}_{4}}+C\xrightarrow[{}]{\Delta }CaO+S{{O}_{2}}+CO\]
    \[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\xrightarrow[{}]{\Delta }F{{e}_{2}}{{O}_{3}}+3S{{O}_{3}}\]
    \[S+2{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{\Delta }3S{{O}_{2}}+2{{H}_{2}}O\]
    \[{{H}_{2}}S{{O}_{4}}+PC{{l}_{s}}\xrightarrow[{}]{\Delta }\underset{Chloro\,sulphonic\,acid}{\mathop{S{{O}_{3}}HCl}}\,\]\[+POC{{l}_{3}}+HCl\]
    Thus, \[S{{O}_{3}}\]is obtained by heating \[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}.\]


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