A \( 2.5 \mathrm{gm} \) impure sample containing weak monoacidic base (Mol. wt. \( =45 \) ) is d...

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A \( 2.5 \mathrm{gm} \) impure sample containing weak monoacidic base (Mol. wt. \( =45 \) ) is dissolved in \( 100 \mathrm{ml} \) water and titrated
P with \( 0.5 \mathrm{M} \mathrm{HCl} \) when \( \left(\frac{1}{5}\right)^{\text {th }} \) of the base was neutralised

W the \( \mathrm{pH} \) was found to be 9 and at equivalent point \( \mathrm{pH} \) of solution is 4.5. Given : All data at \( 25^{\circ} \mathrm{C} \& \log 2=0.3 \). Select correct statement(s).
(a) \( \mathrm{K}_{\mathrm{b}} \) of base is less than \( 10^{-6} \)
(b) Concentration of salt (c) at equivalent point is \( 0.25 \mathrm{M} \)
(c) Volume of \( \mathrm{HCl} \) is used at equavalent point is \( 100 \mathrm{ml} \)
(d) Weight percentage of base in given sample is \( 80 \% \)
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