A) \[HCl\]and\[NaOH\]
B) \[KOH\]and\[C{{H}_{3}}COOH\]
C) \[C{{H}_{3}}COOH\]\[NaCl\]
D) \[C{{H}_{3}}COOH\]and\[C{{H}_{3}}COONa\]
Correct Answer: D
Solution :
Key Idea: Buffer is a mixture of weak add with its salt with strong base or mixture of weak base and its salt with strong add: [a] \[HCl+NaOH\] is not buffer because both are strong acid and strong base. [b] \[KOH+C{{H}_{3}}COOH\] is not buffer because they do not have, common ion. [c] \[C{{H}_{3}}COOH+NaCl\] is not buffer because they do not have common ion. [d] \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] are buffer because \[C{{H}_{3}}COOH\] is weak acid and \[C{{H}_{3}}COONa\] its salt with strong base \[(NaOH)\].
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