Answer
a) Strong acids have greater tendency to lose its protons than weak acids.
b) Strong acids have higher $K_{a}$ than weak acids.
c) Strong acids have lower $pK_{a}$ than weak acids.
Work Step by Step
a) Strong acids dissociates completely but weak acid don't.
b) $K_{a}$ is the equilibrium constant of the dissociation of the acids which is a ratio of product of concentration of dissociated ions to the acid. As dissociation increases the concentration of ions, stronger acids have higher $K_{a}$.
c) $pK_{a}$ is the negative log of $K_{a}$ , so when $K_{a}$ increases, $pK_{a}$ decreases-- as in case of strong acid.
