An aqueous solution at room temperature contains \( 0.1 M \mathrm{NH}_{4} \mathrm{Cl} \) and \( ...

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An aqueous solution at room temperature contains \( 0.1 M \mathrm{NH}_{4} \mathrm{Cl} \) and \( 0.01 \mathrm{MH}_{4} \mathrm{OH} \) \( \left(\mathrm{p} K_{b}=5\right) \), the \( \mathrm{pH} \) of the solution is :
(a) \( 7.5 \)
(b) \( 6.8 \)
(c) \( 6.5 \)
(d) \( 8.0 \)
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