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A dry pellet of a common base B, when kept in open, absorb moisture and turns sticky. The compound is also a by–product of chloralkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution.
 
In this case, the common base 'B' is , which is hygroscopic and absorbs moisture from the environment. It is also a byproduct of the Chlor-alkali process.
 
The Chlor-alkali process involves the electrolysis of  to produce aqueous sodium hydroxide in the presence of hydrogen gas and chlorine gas.
 
The reaction with acidic oxide is as follows: