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NEET Sample Paper NEET Sample Test Paper-18

  • question_answer
    The pH of a solution obtained by mixing equal volumes\[\frac{N}{10}NaOH\] and \[\frac{N}{20}\,HCl\]is?

    A)  12.4               

    B)  1.6

    C)  2.2                             

    D)  13.4

    Correct Answer: B

    Solution :

    \[{{N}_{1}}{{V}_{1\,base}}-{{N}_{2}}{{V}_{2acid}}={{N}_{R}}({{V}_{1}}+{{V}_{2}})\] \[\frac{1}{10}\times V-\frac{1}{20}\times V={{N}_{R}}\times 2\times V\] \[\frac{0.05}{2}={{N}_{R}}\] \[{{N}_{R}}=0.025\,\] \[[{{H}^{+}}]=0.025\,M\] \[pH=-\log [0.025]=1.6.\] Hence, the correct option is [b].


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