Question

The dissociation constants of monobasic acids $A,B,C,D$ are $6\times {10}^{-4},5\times {10}^{-5},3.6\times {10}^{-6},and7\times {10}^{-10}$ respectively. The pH values of their $0.1$ molar aqueous solutions are in the order:

• A. $A<B<D<C$
• B. $A>B>C>D$
• C. $A=B=C=D$
• D. $D>C>B>A$

Answer 1

The correct option is D $D>C>B>A$

(D) $D>C>B>A$

because $\left[H^{+}\right]=\sqrt{K\times C}$

$\therefore$ for some value of C, large value of K, g regular is

$\left[H^{+}\right]$ and lower the pH value.