Combustion And Flame Test - 4

Coal tar is extracted as its ammoniacal solution during the destructive distillation of coal.

Coal gas is a mixture of hydrogen, methane, carbon monoxide, ethylene, acetylene, benzene, etc.
Hence, the statement that coal gas is characterised by the absence of hydrocarbons is incorrect.

Fractional distillation is the process by which oil refineries separate crude oil into different, more useful hydrocarbon products based on the difference in their boiling points in the distillation tower. Bitumen (asphalt) is the non-volatile residue left after the fractional distillation of petroleum.

'Vaseline' belongs to the class of petrochemicals and is a product of fractional distillation of petroleum.

Petroleum companies extract crude oil from the Earth using a perforation in the Earth`s surface called an oil well. Crude oil is a liquid form of petroleum.

Sunlight is available in abundance and its availability is not affected by its use.

Hence, it is an inexhaustible natural resource.

Steel is an alloy of iron and carbon (coke). Coke is obtained during the destructive distillation of coal.

The most suitable temperature and pressure conditions for the formation of petroleum is high temperature and high pressure.

Compressed Natural Gas (CNG) is a fuel source that is made from compressing natural gas to less than 1% of its standard atmospheric volume. The use of natural gas as a vehicle fuel was first introduced in the late1800s, with the first Natural Gas Vehicle (NGV) patented in the US.