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B
H3BO3+Na3BO3
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C
HClO4+NaClO4
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D
NH4OH+(NH4)2SO4
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Solution
The correct option is AHClO4+NaClO4 A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it.
HClO4 and NaClO4 is not a buffer solution becasue both acid and salt are strong.