Which substance is used as an explosive?

Celluloid
Gun cotton
Cellulose butyrate
Cellulose Acetate

The correct answer is (b), gun cotton. Gun cotton is a highly flammable explosive made from cellulose nitrate. It is used in a variety of applications, including ammunition, fireworks, and blasting caps.

Celluloid is a flammable plastic made from cellulose nitrate and camphor. It was once widely used in products such as cameras, combs, and billiard balls, but it has been largely replaced by safer materials due to its flammability.

Cellulose butyrate is a cellulose ester that is used in a variety of applications, including plastics, adhesives, and coatings. It is not flammable.

Cellulose acetate is a cellulose ester that is used in a variety of applications, including textiles, films, and plastics. It is not flammable.