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NEET Chemistry Analytical Chemistry Question Bank Self Evaluation Test - Analytical Chemistry

  • question_answer
    1.25 g of a sample of \[N{{a}_{2}}C{{O}_{3}}\] and \[NaS{{O}_{4}}\] is dissolved in 250 ml solution. 25 ml of this solution neutralises 20 ml of 0. 1 N\[{{H}_{2}}S{{O}_{4}}\]. The % of \[N{{a}_{2}}{{O}_{2}}\] in this sample is

    A) 84.8%              

    B) 8.48%

    C) 15.2%              

    D) 42.4%

    Correct Answer: A

    Solution :

    [a] Let the amount of \[N{{a}_{2}}C{{O}_{3}}\] present in the mixture be x g. \[N{{a}_{2}}S{{O}_{4}}\] will not react with\[{{H}_{2}}S{{O}_{4}}\]. Then \[\frac{x}{53}~=\frac{20\times 0.1\times 10}{1000}\therefore x=1.60g\] \[\therefore \] Percentage of \[N{{a}_{2}}C{{\text{O}}_{3}}\] \[=\frac{1.06\times 100}{1.25}=84%\]%


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