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JEE Main & Advanced JEE Main Paper (Held On 11-Jan-2019 Morning)

  • question_answer
    A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 mL of \[C{{O}_{2}}\]at T= 298.15 K and P = 1 bar. If molar volume of \[C{{O}_{2}}\]is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet? [Molar mass of\[NaHC{{O}_{3}}=84g\,mo{{l}^{-1}}\]] [JEE Main Online Paper (Held On 11-Jan-2019 Morning]

    A) 0.84                             

    B) 8.4

    C) 33.6                 

    D)   16.8

    Correct Answer: B

    Solution :

    \[2NaHC{{O}_{3}}+{{(COOH)}_{2}}\xrightarrow[{}]{{}}\]\[{{(COONa)}_{2}}+2{{H}_{2}}O+2C{{O}_{2}}\]\[0.25mL\] \[T=298.15K,P=1bar\] \[n=\frac{0.25}{25000}={{10}^{-5}}\] No. of moles \[(n)=\frac{Weight}{Molecular\,weight}\] \[w=84\times {{10}^{-5}}g=\frac{84\times {{10}^{-5}}}{{{10}^{-2}}}\times 100=8.4%\]


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