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JEE Main & Advanced Chemistry Solutions / विलयन Question Bank Method of expressing concentration of solution

  • question_answer
    To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid \[({{H}_{3}}P{{O}_{3}}),\] the volume of 0.1 M aqueous KOH solution required is                               [AIEEE 2004]

    A)                 40 mL    

    B)                 20 mL

    C)                 10 mL    

    D)                 60 mL

    Correct Answer: A

    Solution :

               \[{{H}_{3}}P{{O}_{3}}\] is a dibasic acid               \[{{N}_{1}}{{V}_{1}}\](acid) \[={{N}_{2}}{{V}_{2}}\] (base)                    \[0.1\times 2\times 20=0.1\times 1\times {{V}_{2}}\]                                 \[\therefore \]\[{{V}_{2}}=\frac{0.1\times 2\times 20}{0.1\times 1}=40\,ml\]


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