How is the concentration of hydroxide ions` (OH^(–))` affected when excess base is dissolved in a solution of sodium hydroxide?

The conjugate base of hydroxide ion is

What happens when aluminium oxide dissolves in aqueous sodium hydroxide?

When aqueous solution of sodium hydroxide is electrolysed ?

The product of molar concentration of hydrogen ions and hydroxide ions in a 0.01 M aqueous solution of sodium chloride is known as

The product of molar concentrations of hydrogen ions and hydroxide ions in a 0.01 M aqueous solution of sodium chloride is known as

A white solid P, on strong heating, decomposes to give reddish brown gas R and a residue Q. The residue R is yellow when hot and white when cold. The solution of white solid P in water gives white precipitate S, with concentrated sodium hydroxide. The white precipitate S dissolves in excess of sodium hydroxide solution to form colourless solution. Another sample of the solid P in water is mixed with ferrous sulphate solution and then to this solution are added a few drops of conc. sulphuric acid. A brown ring is formed at the junction of liquids. Answer the following questions: Name the salt formed when S dissolves in excess of sodium hydroxide.

The products obtained when iodine reacts with hot and concentrated solution of sodium hydroxide are