The energy stroed in the fossil fuels is :

• heat energy

• electrical energy

• chemical energy

• mechanical energy

The greenhouse effect is due to an excessive emission of

• oxides of sulphur

• oxides of nitrogen

• carbon dioxide

• oxides of carbon

The product not obtained from coal is

• coke

• coal tar

• coal gas

• petroleum

The major constituent of natural gas is/are

• butane

• methane

• methane + hydrogen

• ethane

The major constituents of coal gas are

• carbon monoxide, hydrogen

• methane + hydrogen

• methane

• carbon monoxide + methane