Which of the following mixtures will act as buffer?

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$H_{2} {CO}_{3} + NaOH (1.5 : 1 molar ratio)$

$H_{2} {CO}_{3} + NaOH (1.5 : 2 molar ratio)$

${NH}_{4} OH + HCl (5 : 4 molar ratio)$

${NH}_{4} OH + HCl (4 : 5 molar ratio)$

answer is A, B, C.

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Detailed Solution

(a) ${NaHCO}_{3} + H_{2} {CO}_{3}$

(b) ${NaHCO}_{3} + {Na}_{2} {CO}_{3}$

Correct option is A, B, C

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