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The range of most suitable indicator which should
P be used for titration of \( \operatorname{NaX}(0.1) \mathrm{M}, 10 \mathrm{ml}) \) with 0.1

W
\( \mathrm{M} \mathrm{HCl} \) should be \( \left(K_{\mathrm{b}}\right. \) of \( \left.\mathrm{X}^{-}=10^{-6}\right) \)
(1) \( 2-3 \)
(2) \( 3-5 \)
(3) \( 6-800000000 \)
(4) \( 8-10 \)
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