The conjugate acid of $HPO_3^{2-}$ is

Which of the following cannot act as a Lewis or Bronsted acid?

Which statement about the following equilibrium is true?
$(CH_3)_3CO^-K^+ + H_2O \rightleftharpoons (CH_3)_3COH + K^+OH^-$
Given: $pK_a(H_2O) = 15.7$,$pK_a((CH_3)_3COH) = 18$

The conjugate base of phosphorus acid is $x$. The conjugate base of oleum is $y$. What are $x$ and $y$,respectively?

Which one is not an acid salt?

Discuss the factors affecting acid strength with examples.