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0.1 mole of \( \mathrm{CH}_{3} \mathrm{NH}_{2}\left(\mathrm{~K}_{\mathrm{b}}=5 \times 10^{-4}\right) \) is mixed with
P 0.08 mole of \( \mathrm{HCl} \) and the solution diluted to one litre.

W The \( \mathrm{H}^{+} \)ion concentration in the solution will be
(1) \( 1.6 \times 10^{-11} \)
(2) \( 8 \times 10^{-11} \)
(3) \( 5 \times 10^{-5} \)
(4) \( 8 \times 10^{-2} \)
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