A) \[N{{H}_{4}}OH+N{{H}_{4}}Cl\]
B) \[NaOH+N{{a}_{2}}S{{O}_{4}}\]
C) \[NaOH+C{{H}_{3}}COONa\]
D) \[{{K}_{2}}S{{O}_{4}}+{{H}_{2}}S{{O}_{4}}\]
Correct Answer: A
Solution :
Key Idea A solution with reserve acidity or basicity is known as buffer. These are of two types (i) Acidic buffer solution A mixture of weak acid and its salt with strong base. Example : \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\]. (ii) Basic buffer solution A mixture of weak base and its salt with strong acid. Example \[N{{H}_{4}}OH+N{{H}_{4}}Cl\] \[N{{H}_{4}}OH+N{{H}_{4}}Cl\] is a basic buffer because it is a mixture of weak base and its salt with strong acid. \[NaOH+N{{a}_{2}}S{{O}_{4}}\] and \[NaOH+C{{H}_{3}}COONa\]are not buffer because in these mixture strong base is present. \[{{K}_{2}}S{{O}_{4}}+{{H}_{2}}S{{O}_{4}}\] is not a buffer due to the presence of strong acid.
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