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Dear Parth,
a) will not form a buffer because it is a mixture of a strong base and a strong acid.b) will not form a buffer because it is a mixture of a neutral salt and a strong acid.c) will form a buffer because it is a mixture of a weak acid and its conjugate base. 0.2 mol of NaOH will neutralize 0.2 mol of HNO2; you'll be left with 0.2 mol of HNO2 and 0.2 mol of NaNO2 (or, more specifically, NO2^-). The pH will be equal to the pKa of HNO2.d) would have formed a buffer if you had added less HCl; however, you're adding so much HCl that it completely protonates NH3 to NH4+. You'll be left with 0.5 mol of NH4+ and 0.5 mol of Cl-.
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