Solution:● Combustible substance: Combustible substances are substances that burn quickly or catch fire quickly.
● Combustible materials include LPG, paper, clothing, wood, and clothing. A fire cannot be started without these materials.
● Camphor is a waxy, combustible solid that can be white or translucent and has a pungent aromatic odour.
● Oxides, like silica, make up the majority of glass. The elements will not interact with oxygen since they are in their highest oxidation states. Glass is therefore not combustible.
● Hydrocarbons, particularly those with low molecular masses, such as alcohol, are exceedingly flammable. They effortlessly combine with oxygen to produce carbon dioxide and water. They can also produce some carbon monoxide if there is not enough oxygen.