A solid substance P which is very hard is used in the construction of many buildings, especially flooring.

A solid substance P which is very hard is used in the construction of many buildings, especially flooring. When substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water with the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P.

(a) What is substance P ? Write its common name as well as chemical formula. 

(b) What is substance Q ? 

(c) What is gas R ? 

(d) What is substance S ? What is its clear solution known as ? 

(e) What is substance T ? Name any two natural forms in which substance T occurs in nature.