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Buffer solutions have constant acidity a...

Buffer solutions have constant acidity and alkalinity because

A

They have large excess of `H^(+) or OH^(-)` ions

B

They have fixed value of pH

C

These give unionised acid or base on reaction with added acid or alkali

D

Acids and alkalies in these solutions are shielded from attack by other ions

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The correct Answer is:
C
These give unionised acid or base on reaction with added acid or alkali
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