When $SO_3$ is treated with heavy water,the product is:

What is 'plumbo solvency' referring to in the context of lead?

Why does hard water not form lather with soap?

Assertion $(A)$ : $NaCl$ is less soluble in heavy water than in ordinary water.
Reason $(R)$ : Dielectric constant of ordinary water is more than that of heavy water.
The correct answer is

Permutit is the technical name given to:

Lime or $CaCl_2$ is added to water to remove which of the following impurities?