A) \[HN{{O}_{2}}\] and \[NaN{{O}_{2}}\]
B) NaOH and NaCl
C) \[HN{{O}_{3}}\] and \[N{{H}_{4}}N{{O}_{3}}\]
D) HCl and KCl
Correct Answer: A
Solution :
A pair constituent with a \[HN{{O}_{2}}\] and \[NaN{{O}_{2}}\] because \[HN{{O}_{2}}\] is weak acid and \[NaN{{O}_{2}}\] is a salt of weak acid \[(HN{{O}_{2}})\] with strong base (NaOH). Hence, it is an example of acidic buffer solution.
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