The _____________ demand of fossil fuel and usage is resulting in depletion of these useful resources.

When fossil fuels are burned, they release ___________________  into the atmosphere, which contribute to the formation of acid rain.

Coal and petroleum are important ______________________  fossil fuel.

Petroleum is commonly called as  ___________________

Which variety of coal contains the highest percentage of carbon?

Higher the Calorific Value of a fuel the _______________ heat it produces when burned.

The residue left behind after the dry distillation of coal is  ______________________

Petroleum is ___________________

Petroleum is refined by  _________________

Which of the following components does not vaporize during the fractional distillation of petroleum ?