The compound that is not a Lewis acid is

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:

In the reaction $HNO_3 + HF \to H_2NO_3^+ + F^-$,which species acts as a base?

Aqueous ammonia is used instead of aqueous $NaOH$ solution to precipitate $Al^{3+}$ ions as $Al(OH)_3$ because .................

The $CH_3COO^-$ ion is a.......

The strongest Bronsted base among the following anions is: