The ratio of the viscosity (in centipoise) of $D_2O$ to that of $H_2O$ at $25^{\circ} C$ is

Discuss briefly the demineralization of water by ion exchange resin.

When the first element of the periodic table is treated with dioxygen,it gives a compound whose solid state floats on its liquid state. This compound has an ability to act as an acid as well as a base. What products will be formed when this compound undergoes autoionisation?

What is plumbosolvency,the dissolution of lead in?

When zeolite,which is hydrated sodium aluminium silicate,is treated with hard water,the sodium ions are exchanged with

The most effective water softening method is