The ionisation constant of an acid, \( K_{a} \), is the measure of strength of an acid. The \( K...

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The ionisation constant of an acid, \( K_{a} \), is the measure of strength of an acid. The \( K_{a} \) values of acetic acid, hypochlorous acid and formic acid are \( 1.74 \times 10^{-5}, 3.0 \times 10^{-} \) 8 and \( 1.8 \times 10^{-4} \) respectively. Which of the following orders of \( \mathrm{pH} \) of \( 0.1 \mathrm{~mol} \mathrm{dm}^{-3} \) solutions of these acids is correct?
(a) acetic acid \( \) hypochlorous acid \( \) formic acid
(b) hypochlorous acid \( \) acetic acid \( \) formic acid
(c) formic acid \( \) hypochlorous acid \( \) acetic acid
(d) formic acid \( \) acetic acid \( \) hypochlorous acid
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