Carbon and Fossil Fuels

LPG (Liquefied Petroleum Gas) contains butane and propane.

Water is not a component of crude oil. We do not get water when crude oil is refined or processed.

Bio gas is not a fossil fuel, it is formed by bio mass.

Fine powder can be used to reduce friction on a carrom board.

 Wood undergoes slow combustion on burning.

 Petrol is a constituent of petroleum, which is used as a solvent for dry cleaning.

This is the correct option. Petroleum is a complex mixture of carbon and hydrogen. Carbon and hydrogen make up the compounds called hydrocarbons.

This is the correct option as naphthalene is a carbon compound that is present in coal tar. It is not obtained by the refining of petroleum.

 Petroleum is known as black gold.

 Burning of  natural gas produces the least amount of carbon dioxide per unit of energy.

The characteristics of an ideal fuel are:

(i)    Low ignition temperature (ii)   High calorific value (iii)  Residues that do not pollute the environment

This is the correct option as the buried remains of large plants are converted into coal.

Both a and b are solid fuels.

This is the correct option. Carbon occurs in free state in the form of graphite. Only a small amount of carbon occurs in free state in the earth's crust.

This is the correct option. Coal and charcoal contain free carbon.