The dissociation constants of four monobasic acids HA, HX, HY and HD are respectively 6 x 10-4, 5 x 10-5, 3.6 x 10-6 and 7 x 10-10. The pH values of their 0.1M solutions is
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a
HA > HX > HY > HD
b
HD > HY > HX > HA
c
All the solutions have same pH
d
HX > HD > HY > HA
answer is B.
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Detailed Solution
PH of a weak monobasic acids is given by,PH = 12[pKa-logC0]∴ The concentration is same, pKa value will decide the pH.PH : HA < HX < HY < HD.