A dry pellet of a common base B when kept in open absorbs moisture and turns sticky

A dry pellet of a common base B when kept in open absorbs moisture and turns sticky. The compound is also a by-product of chlor-alkali process.
(i) Identify B.
(ii) What type of reaction occurs when B is treated with an acidic oxide?
(iii) Write a balanced chemical equation for one such solution.

(i) B is sodium hydroxide (NaOH).
(ii) Neutralisation reaction occurs when B is treated with an acidic oxide.
(iii)