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NEET Sample Paper NEET Sample Test Paper-65

  • question_answer
    The ionic strength of \[N{{a}^{+}}\] on mixing 100 mL 0.1 M Nacl and 100 mL 0.1 M \[N{{a}_{2}}S{{O}_{4}}\] is:

    A) 0.2                               

    B) 0.1

    C) 0.3                               

    D) 0.075

    Correct Answer: D

    Solution :

    \[{{M}_{1}}{{V}_{1}}+{{M}_{2}}{{V}_{2}}={{M}_{3}}{{V}_{3}}\] \[0.1\times 100+2\times 0.1\times 100\,\,=\,\,x+200\] \[Conc.\,\,of\,\,N{{a}^{+}}\,=\,\,\frac{100\times 0.1}{200}+\frac{100\times 0.1\times 2}{200}\,\,=\,\,0.15\,\,M\]\[\therefore \,\,\,\,\,\,Ionic\,\,strength\,\,=\,\,\frac{1}{2}\,C{{Z}^{2}}\,=\,\frac{1}{2}\,\times \left[ 0.15\times {{1}^{2}} \right]\,\,=\,\,0.075\]


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