What happens when a concentrated solution of sodium chloride (brine) is electrolyzed? Write the equation of the reaction involved.

Explain why, sodium hydrogencarbonate is used as an antacid.

What does a soda-acid type fire extinguisher contain? How does it work? Explain the working of a soda � acid fire extinguisher with the help of a labelled diagram.

Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?

Name three products of the chlor-alkali process. State two uses of each of these products.