When \( \mathrm{NH}_{4} \mathrm{Cl} \) is added to a solution of \( \mathrm{NH}_{4} \mathrm{OH} ...

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When \( \mathrm{NH}_{4} \mathrm{Cl} \) is added to a solution of \( \mathrm{NH}_{4} \mathrm{OH} \) :
(a) The dissociation of \( \mathrm{NH}_{4} \mathrm{OH} \) increases.
(b) The concentration of \( \mathrm{OH}^{-} \)increases.
(c) The concentrations of both \( \mathrm{OH}^{-} \)an \( \mathrm{NH}_{4}^{+} \)increase.
(d) The concentration of \( \mathrm{OH}^{-} \)ion decreases.
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