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JEE Main & Advanced JEE Main Paper (Held On 9 April 2017)

  • question_answer
    What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution? [JEE Online 09-04-2017]

    A)  316                                       

    B)  320

    C)  325                                       

    D)  330

    Correct Answer: A

    Solution :

                    \[\frac{V\times 45}{100}+\frac{(800-V)20}{100}=\frac{800\,\times 29.875}{100}\]                 \[\frac{9V}{20}+160-\frac{V}{5}\,=239\]                 \[\frac{5V}{20}=79\Rightarrow \,V=316\,\]


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