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BHU PMT BHU PMT (Mains) Solved Paper-2005

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

    A)  1.12L                                    

    B)  0.84L

    C)  2.24 L                                   

    D)  4.06 L

    Correct Answer: A

    Solution :

                     \[\underset{\begin{smallmatrix}  137+42+48 \\  =197\,g \end{smallmatrix}}{\mathop{BaC{{O}_{3}}}}\,\xrightarrow{{}}BaO+\underset{22.4L\text{ }at\text{ }STP}{\mathop{C{{O}_{2}}}}\,\] \[\because \]197 g of\[BaC{{O}_{3}}\]gives\[22.4\text{ }L\text{ }C{{O}_{2}}\]at STP \[\therefore \]9.85 g of\[BaC{{O}_{3}}\]gives\[=\frac{22.4}{197}\times 9.85\] \[=1.12L\]


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