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

(N/A) The common base $B$ is Sodium hydroxide $(NaOH)$. It is a deliquescent substance,meaning it absorbs moisture from the atmosphere and becomes sticky.
The reaction between a base and an acidic oxide is a neutralization reaction,which produces salt and water.
When $NaOH$ reacts with carbon dioxide $(CO_2)$,which is an acidic oxide,the balanced chemical equation is:
$2NaOH + CO_2 \rightarrow Na_2CO_3 + H_2O$