Name the black residue left behind in the glass tube during destructive distillation of coal.

Least polluting fuel for vehicle is ________.

Fossil fuels can be made in the laboratory.

CNG is more polluting fuel than petrol.

Coke is almost pure form of carbon.

Coal-tar is a mixture of various substances.

Kerosene is not a fossil fuel.

Explain why fossil fuels are exhaustible natural resources?

Describe characteristics and uses of coke.

Explain the process of formation of petroleum.

The following Table shows the total power shortage in India from 1991-1997. Show the data in the form of a graph. Plot shortage percentage for the year on the Y-axis and the year on the X-axis.