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Q.

Which of the following is/are correct for buffer solution ?

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a

Acidic buffer will be effective within in the pH range $(p K_{a} \pm 1)$

b

Basic buffer will be effective within the pH range $(p K_{w} - p K_{b} \pm 1)$

c

${CH}_{3} {COONH}_{4}$ is a buffer

d

Buffers behave most effectively when the $[C o n j u g a t e b a s e] / [C o n j u g a t e A c i d]$ ratio equal to 2

answer is A, B, C.

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Detailed Solution

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For acidic buffer capacity is maximum at $p H = p K_{a}$ and for basic buffer. It is maximum at $p^{H} = p K_{w} - p K_{b}$
Buffer is always effective within a $p H$ range of 1 with respect to the $p H$ at maximum buffer capacity
$H_{3} P O_{4} + H P {O_{4}}^{2 +}$ is buffer solution

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