Combustion And Fuel Test - 2

The burners in LPG stoves are provided with holes in order to ensure a proper supply of air.
Hence, due to the availability of oxygen in sufficient amounts, complete combustion of the fuel takes place and a clean blue flame is formed.

LPG is the best fuel among the given options because:
It is a clean fuel.
It has a high calorific value.
It is easy to store and transport.
It is easily available and is affordable.

Anthracite is the variety of coal with the highest carbon content and hence, the highest calorific value.

In the thermal power plants, coal is used as a fuel to boil the water and produce steam to run the turbine in order to generate electricity.

The dead vegetation under the earth slowly gets converted to coal under geothermal conditions.
Since coal is essentially an elemental form of carbon, the process is called carbonisation.

Coal gas is a mixture of hydrogen, methane, and carbon monoxide.
Sulphur dioxide is not a component of coal gas.

The percentage of carbon is the lowest in peat and the highest in anthracite.

Liquefied Petroleum Gas (LPG) is the chief domestic fuel.
Natural gas is replacing petrol as an automobile fuel in India.

Coal is used in thermal power plants for generating electricity.
Dry wood is used as a fuel.

'Petra' is a generic word used for rock, and 'oleum' is a dense, corrosive liquid consisting of concentrated sulphuric acid, containing excess sulphur trioxide in solution.
Petroleum is named so because it is a dense corrosive liquid which is derived from the rocks beneath the earth.

The lower boiling fractions are collected in the upper parts of the fractional column. Hence, statement I is correct.
Since natural gas has the lowest boiling point amongst all the fractions, it is collected in the uppermost part of the fractional column. Hence, statement II is correct.

The temperature is lower in the upper parts of the chamber. Hence, statement III is incorrect.