Haber process is used for the production of which of the following?

The general formula of alum is:

Discuss the general characteristics of Group $15$ elements with reference to their electronic configuration,oxidation state,atomic size,ionisation enthalpy and electronegativity.

The reaction of $HNO_3$ with $P_4O_{10}$ produces ....

Atoms in a $P_4$ molecule of white phosphorus are arranged regularly in space in which of the following way?

The number of hydroxyl group in pyrophosphoric acid is