The molar conductivity of a solution of a weak acid HX (0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY (0.10 M). If $$\lambda_X^0 \approx \lambda_Y^0$$, the difference in their $$pK_a$$ values, $$pK_a (HX) - pK_a (HY)$$, is (consider degree of ionization of both acids to be $$\ll 1$$