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An acid type indicator, HIn differs in colour from its
P conjugate base \( \left(\operatorname{In}^{-1}\right) \). The human eye is sensitive to

W colour differences only when the ratio \( \left[\operatorname{In}^{-}\right] /[\mathrm{HIn}] \) is greater than 10 or smaller than 0.1 . What should be the minimum change in the \( \mathrm{pH} \) of the solution to observe a complete colour change \( \left(K_{\mathrm{a}}=1.0 \times 10^{-5}\right) \) ?
(1) 0.0
(2) 1.0
(3) 2.0
(4) 5.0
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