Some important materials used in preparation of compounds

A compound which is strong oxidizing angent and has orange coloured crystal. It is used in the preparation of azo compounds. Identify the compound.

The most important raw materials used in the manufacture of cement are

A common material used in the preparation of aspirin , plastic and picric acid is __________.

Which of the following plant material is widely used in the preparation of culture medium

Explain a process in which a biocatalyst is used industrial preparation of a compound known to you.