A) \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\]
B) \[{{H}_{3}}B{{O}_{3}}+N{{a}_{3}}B{{O}_{3}}\]
C) \[HCl{{O}_{4}}+NaCl{{O}_{4}}\]
D) \[N{{H}_{4}}OH+{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\]
Correct Answer: C
Solution :
Key Idea: Buffer are mixture of ether weak acid and its salt with strong base or weak base and its salt with strong acid. [a] \[\text{C}{{\text{H}}_{\text{3}}}\text{COOH}\,\text{+}\,\text{C}{{\text{H}}_{\text{3}}}\text{COONa}\] is buffer because\[\text{C}{{\text{H}}_{\text{3}}}\text{COOH}\]is weak acid and \[\text{C}{{\text{H}}_{\text{3}}}\text{COONa}\] is it salt with strong base. [b] \[{{\text{H}}_{\text{3}}}\text{B}{{\text{O}}_{\text{3}}}\text{+}\,\text{N}{{\text{a}}_{\text{3}}}\text{B}{{\text{O}}_{\text{3}}}\]is buffer because\[{{\text{H}}_{\text{3}}}\text{B}{{\text{O}}_{\text{4}}}\] is weak acid and \[\text{N}{{\text{a}}_{\text{3}}}\text{B}{{\text{O}}_{\text{3}}}\] is its salt with strong base. [c] \[\text{HCl}{{\text{O}}_{\text{4}}}\text{+}\,\text{NaCl}{{\text{O}}_{\text{4}}}\]is not buffer both acid and salt are strong. [d] N\[\text{N}{{\text{H}}_{\text{4}}}\text{OH}\,\text{+}\,{{\text{(N}{{\text{H}}_{\text{4}}}\text{)}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] is buffer because \[\text{N}{{\text{H}}_{\text{4}}}\text{OH}\]is weak base and \[{{\text{(N}{{\text{H}}_{4}}\text{)}}_{2}}\text{S}{{\text{O}}_{4}}\] is its salt with strong acid.
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