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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 alkalis in these solutions are shielded from attack by other ions.

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Buffer solutions give unionised acid or base on reaction with added acid or alkali.
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