JEE Main & Advanced Chemistry The s-Block Elements / s-ब्लॉक के तत्व Question Bank Mock Test - The s-Block Elements

  • question_answer
    Sodium is heated n excess of air, free from \[C{{O}_{2}}\]at \[350{}^\circ \]C to from X. X. absorbs \[C{{O}_{2}}\] and forms \[N{{a}_{2}}C{{O}_{3}}\]and Y. 'X' and 'Y' are respectively:

    A) \[N{{a}_{2}}{{O}_{{}}}\]and \[{{O}_{2}}\]

    B) \[N{{a}_{2}}{{O}_{2}}\]and \[{{O}_{2}}\]

    C) \[Na\]\[{{O}_{2}}\] and \[{{O}_{2}}\]

    D) \[N{{a}_{2}}{{O}_{2}}\] and \[{{O}_{3}}\]

    Correct Answer: B

    Solution :

    [b] \[2Na+{{O}_{2}}(air)\xrightarrow{350{}^\circ C}N{{a}_{2}}{{O}_{2}}(X)\]           
    \[2C{{O}_{2}}+2N{{a}_{2}}{{O}_{2}}\to 2N{{a}_{2}}C{{O}_{3}}+{{O}_{2}}(Y)\]
    Note: \[N{{a}_{2}}{{O}_{2}}+{{O}_{2}}\xrightarrow[300atm]{450{}^\circ C}2Na{{O}_{2}}\]
    \[Na+{{O}_{2}}\] (limited amount)\[\xrightarrow{180{}^\circ C}N{{a}_{2}}O\]
     


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