NEET 2006 Chemistry question

Which of the following pairs constitutes a buffer:-

(1) & Correct
(2)NaOH & NaCl
(3) &
(4)HCl & KCl

Answer: (1)

Solution

An acidic buffer consists of a weak acid and its salt with a strong base (or a weak base and its salt with a strong acid). is a weak acid and is its sodium salt, so this pair resists changes in pH: option (1). NaOH

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Question ID VK-089616