Fill in the blanks:

1. The expansion of LPG is ___________.

2. LPG is stored in _____________ form in the gas cylinder.

3. The expansion of CNG is _________________.

4. The chief element in coal is _______________.

5. Natural gas contains mainly ___________________.

6. Heating in the absence of air is called _______________.

7. ______________ is the primary source of energy.

8. The coal obtained in Neyveli is _________.

9. The process of separating individual liquids, from the mixture of liquids which differ in their boiling point is called _____________.

10. ___________ is used as a reducing agent in steel manufacturing.

1. The expansion of LPG is liquid petroleum gas.

LPG is a hydrocarbon gas used as fuel in heating appliances, cooking equipment, and vehicles.

2. LPG is stored in gas form in the gas cylinder.

It is extracted from crude oil and natural gas. And, it is stored in liquid form under pressure in a steel container or tank.

3. The expansion of CNG is Compressed Natural Gas.

Compressed natural gas (CNG) is a fuel which can be used in place of petrol, diesel fuel and propane/LPG.

4. The chief element in coal is carbon.

Coal is mainly composed of carbon, along with other elements: hydrogen, sulphur, oxygen, and nitrogen.

5. Natural gas contains mainly methane.
Natural gas majorly consists of methane and contains small percentage of carbon dioxide, nitrogen, hydrogen sulphide, or helium.

6. Heating in absence of air is called calcination.

Calcination is a process of heating the ore below its melting point in absence of air whereas, roasting is a process of heating the element in presence of air.

7. Fossil fuels Is the primary source of energy
Fossil fuels, including coal, oil and natural gas, are currently the world's primary energy source.

8. The coal obtained in Neyveli is lignite

Jet is a compact form of lignite that is used as an ormental stone in a polished form.

9. The process of separating individual liquids, from the mixture of liquids which differ in their boiling point is called fractional distillation.

Fractional distillation is the separation of a mixture into its component parts, or fractions

10. Iron oxide is used as a reducing agent in steel manufacturing.

In the process of steel manufacturing, iron is changed into steel by blowing oxygen through the molten metal from the Blast Furnace. This oxidises the impurities in the molten metal.