Explain Lewis acid base theory with suitable example. Classify the following species into Lewis acids and Lewis bases and show these act as Lewis acid/Base.
(a) ${\mathrm{O}\mathrm{H}}^{-}$
(b) ${\mathrm{F}}^{-}$
(c) ${\mathrm{H}}^{+}$
(d) ${\mathrm{B}\mathrm{C}\mathrm{l}}_3$

Explain the term Hydrolysis of salts with examples. Discuss the ${\mathrm{P}}^{\mathrm{H}}$ of the following salt solution.

a) salt of weak acid and strong base

Explain the term Hydrolysis of salts with examples. Discuss the ${\mathrm{P}}^{\mathrm{H}}$ of the following salt solution.

a) salts of strong acid and weak base.