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] \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] is buffer because \[C{{H}_{3}}COOH\] is weak acid and \[C{{H}_{3}}COONa\] is it salt with strong base. [b] \[{{H}_{3}}B{{O}_{3}}+N{{a}_{3}}B{{O}_{3}}\] is buffer because \[{{H}_{3}}B{{O}_{4}}\]is weak acid and \[N{{a}_{3}}B{{O}_{3}}\] is its salt with strong base. [c] \[HCl{{O}_{4}}+NaCl{{O}_{4}}\] is not buffer both acid and salt are strong. [d] \[N{{H}_{4}}OH+{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] is buffer because\[N{{H}_{4}}OH\] is weak base and \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] is its salt with strong acid.
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