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Question

Which one is incorrect regarding the representation of buffer index ?

A
[Conjugate base][Weak Acid]<0.1
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B
[Conjugate acid][Weak Base]<10
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C
[Conjugate base][Weak Acid]>0.1
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D
None of the above
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Solution

The correct option is A [Conjugate base][Weak Acid]<0.1
It is generally accepted that a solution has a useful buffer index provided:
0.1<[Conjugate base][Weak Acid] or [Conjugate acid][Weak Base]<10.
So , [Conjugate base][Weak Acid]<0.1 i.e. option (a) is the incorrect.

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