$A$ tribasic acid is:

Which of the following orders of relative strength of acid is correct?

The strongest acid is

The strongest Bronsted base among the following anions is

$Cl^-$ is the conjugate base of .....

The dissociation constants of two acids $HA_1$ and $HA_2$ are $3.14 \times 10^{-4}$ and $1.96 \times 10^{-5}$ respectively. The relative strength of the acids will be approximately: