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When 0.05 moles of the following acids are dissolved
\( \mathrm{P} \) in \( 1000 \mathrm{ml} \) of \( \mathrm{H}_{2} \mathrm{O} \), the \( \left[\mathrm{H}^{+}\right. \)] will be greatest in

W
(1) \( \mathrm{HNO}_{2}: \mathrm{pK}_{\mathrm{a}}=3.0 \)
(2) \( \mathrm{HCOOH}: \mathrm{pK}_{\mathrm{a}}=3.75 \)
(3) \( \mathrm{HCN}: \mathrm{pK}_{\mathrm{a}}=9.4 \)
(4) \( \mathrm{CH}_{3} \mathrm{COOH}: \mathrm{pK}_{\mathrm{a}}=4.75 \)
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