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pH of a buffer solution decreases by 0.0...

pH of a buffer solution decreases by 0.02 units when 0.12g of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at `27^(@)C`. The buffer capacity of the solution is

A

`0.1`

B

10

C

1

D

`0.4`

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The correct Answer is:
D
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