JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer Assuming fully decomposed, the volume of \[C{{O}_{2}}\]released at STP on heating 9.85g of \[BaC{{O}_{3}}\](Atomic mass of Ba=137) will be            [CBSE PMT 2000]

    A)                 0.84 L    

    B)                 2.24 L

    C)                 4.06 L    

    D)                 1.12 L

    Correct Answer: D

    Solution :

               \[BaC{{O}_{3}}\to BaO+C{{O}_{2}}\uparrow \]                    Molecular weight of \[BaC{{O}_{3}}=137+12+3\times 16\]=197                    \[\because \]   197gm produces 22.4L at S.T.P.                                 \[\therefore \]    9.85gm produces \[\frac{22.4}{197}\times 9.85=1.12L\]at S.T.P.

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