J & K CET Engineering J and K - CET Engineering Solved Paper-2011

  • question_answer
    The pH of the solution formed by mixing 20 mL of \[\text{0}\text{.05 M }{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]with 5.0 mL of \[\text{0}\text{.45 M NaOH}\]at 298 K is

    A)  6                

    B)  2

    C)  12               

    D)  7

    Correct Answer: C

    Solution :

     \[0.05\text{ }M\text{ }{{H}_{2}}S{{O}_{4}}=0.05\times 2=0.1\text{ }N\text{ }{{H}_{2}}S{{O}_{4}}\] \[0.45\text{ }M\text{ }NaOH=0.45\times 1=0.45\text{ }N\text{ }NaOH\] \[\text{Meq}\text{. of}\,{{H}_{2}}S{{O}_{4}}=0.1\times 20=2\] \[\text{Meq}\text{. of }NaOH=0.45\times 5=2.25\] \[\text{Meq, of }NaOH\text{ left}=2.25-2=0.25\] Hence, resulting solution is alkaline in nature.


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