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Which of the following will act as buffer.

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$NaCl + NaOH$

Borax + Boric acid

${NaH}_{2} {PO}_{4} + {Na}_{2} {HPO}_{4}$

${NH}_{4} Cl + {NH}_{4} OH$

answer is B, D.

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Detailed Solution

(b) and (d) are correct because they have common and one of them is weak electrolyte.

(a) is not correct because $N a C l$ and $N a O H$ both are strong electrolytes and will not have common ion effect.

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