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NEET Sample Paper NEET Sample Test Paper-86

  • question_answer
    25.3 g of sodium carbonate, \[N{{a}_{2}}C{{O}_{3}}\] is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ions,\[N{{a}^{+}}\] and carbonate ions, \[CO_{3}^{2-}\] are respectively \[(\]Molar mass of \[N{{a}_{2}}C{{O}_{3}}=106\,g\,mo{{l}^{-1}})\]

    A) 0.955 M and 1.910 M

    B) 1.910 M and 0.955 M

    C) 1.90 M and 1.910M

    D) 0.477 M and 0.477 M

    Correct Answer: B

    Solution :

    [b] Concentration of \[N{{a}_{2}}C{{O}_{3}}=\frac{25.3}{106}\times \frac{1000}{250}=0.955\,M\] \[[N{{a}^{+}}]=2\times 0.955=1.91\,M\] \[\left[ CO_{3}^{2-} \right]=0.955\,M\]


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