Amongst the following solutions, the buffer solution is: [MPPMT 1999] (a) \( \mathrm{NH}_{4} \ma...

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Amongst the following solutions, the buffer solution is:
[MPPMT 1999]
(a) \( \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NH}_{4} \mathrm{OH} \) solution
(b) \( \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NaOH} \) solution
(c) \( \mathrm{NH}_{4} \mathrm{OH}+\mathrm{HCl} \) solution
(d) \( \mathrm{NaOH}+\mathrm{HCl} \) solution
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