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

W litre. What will be the \( \mathrm{H}^{+} \)concentration in the solution?
(1) \( 1.25 \times 10^{-4} \mathrm{M} \)
(2) \( 8 \times 10^{-11} \mathrm{M} \)
(3) \( 1.6 \times 10^{-11} \mathrm{M} \)
(4) \( 2 \times 10^{-3} \mathrm{M} \)
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