A volume of \( 10 \mathrm{ml} \) of a strong acid solution of P \( ...

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A volume of \( 10 \mathrm{ml} \) of a strong acid solution of
P \( \mathrm{pH}=2.0 \) are mixed with \( 990 \mathrm{ml} \) of a buffer

W solution of \( \mathrm{pH}=4.0 \). The \( \mathrm{pH} \) of the resulting solution will be
(1) 4.2
(2) 6.0
(3) 4.002
(4) 4.0
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