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From the following tableWhich of the two sets of buffer solutions have least pH ?

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a

I and II

b

I and III

c

II and III

d

II and IV

answer is B.

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Detailed Solution

PH of an acidic buffer is given by, PH=PKa+log[ salt ][ acid ]I.PH=PKa+log4×0.14×0.1=PKaII.PH=PKa+log40×0.14×0.1=PKa+1III.PH=PKa+log4×0.140×0.1=PKa-1IV·PH=PKa+log10×0.10.1×0.1=PKa+2

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From the following tableWhich of the two sets of buffer solutions have least pH ?