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a
100 mL of 0.1MHCl+100 mL of 0.1MNaOH
b
50 mL of 0.1MNaOH+25 mL of 0.1MCH3COOH
c
100 mL of 0.1MCH3COOH+100 mL of 0.1MNaOH
d
100 mL of 0.1MHCl+200 mL of 0.1MNH4OH
answer is D.
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Detailed Solution
Acid-base titration : HCl + NH4OH⟶NH4Cl 10 mmol 20 mmol∴HCl is the limiting reagent. Solution contains NH4OH (weak base) and NH4Cl (salt of strong acid and weak base). Therefore, a basic buffer will be formed.