Give two examples for each of the following substances:

(a) food preservatives

(b) fuels

(c) fungicides

(d) medicines

(e) building materials

(f) chemical war weapons

Answer the following in one or two sentences:

(a) What is science?

(b) What is chemistry?

(c) What is a fuel ?

(d) What is Philosopher's stone'?

Name the chemicals which help in increasing food production.

Who is known as the 'Father of Chemistry'? Why?