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JEE Main & Advanced Sample Paper JEE Main Sample Paper-2

  • question_answer
    A solution is obtained by mixing two solutions of same electrolyte with \[pH=5\] and \[pH=3\]respectively. The resulting solution has pH (Given \[\log \,0.5=-0.3\]

    A)  2                                            

    B)  3.3

    C)  4.0                                        

    D)  4.5

    Correct Answer: B

    Solution :

    When \[pH=5,\,\,[{{H}^{+}}]={{10}^{-5}}M\] When \[pH=3,\,[{{H}^{+}}]={{10}^{-3}}M\] Total \[[{{H}^{+}}]=\frac{{{10}^{-5}}+{{10}^{-3}}}{2}\] \[=\frac{{{10}^{-3}}(1+0.01)}{2}=0.50\times {{10}^{-3}}\] \[pH=-\log \,[{{H}^{+}}]=-\log \,(0.50\times {{10}^{-3}})=3.3\]


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