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MCQ
Which of the following is a buffer solution?
Chemistry
A HCl + NaCl
B CH3COOH + CH3COONa
C NaOH + NaCl
D H2SO4 + Na2SO4
Explanation

A buffer consists of a weak acid (CH3COOH) and its conjugate base (CH3COO- from CH3COONa), which resists pH changes.

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