CHEMISTRY

THE SLOW PROCESS OF CONVERSION OF WOOD INTO COAL OVER MILLIONS OF YEARS IS CALLED______________

• CARBONISATION

• DESTRUCTIVE DISTILLATION

• FOSSIL FUELS

• FRACTIONAL DISTILLATION

Answer explanation

The slow process of conversion of wood into coal over millions of years is called carbonisation, making it the correct choice.

THE PROCESS BY WHICH COAL IS HEATED TO HIGH TEMPERATURE IN THE ABSENCE OF AIR TO PRODUCE COKE, COAL TAR AND COAL GAS IS _________________

______ IS A DARK THICK VISCOUS LIQUID

• COKE

• COAL TAR

• COAL GAS

Answer explanation

The correct choice is COAL TAR because it is a dark thick viscous liquid, while Coke and Coal Gas are not in liquid form.

SOME OF THE EXHAUSTIBLE NATURAL RESOURCES ARE FORMED FROM THE DEAD REMAINS OF PLANTS AND ANIMALS BURIED LONG AGO. THESE RESOURCES ARE CALLED______.

• CARBON

• COAL

• PETROLEUM

• FOSSIL FUELS

Answer explanation

Fossil fuels are formed from the dead remains of plants and animals buried long ago, making them exhaustible natural resources.

COAL GAS IS ALSO KNOWN AS _______ GAS

• NITROGEN

• OXYGEN

• TOWN

• VILLAGE

Answer explanation

COAL GAS IS ALSO KNOWN AS TOWN GAS, making the correct choice 'TOWN'.

WHAT IS THE MAIN COMPONENT OF COAL TAR?

• HYDROGEN

• CARBON

• OXYGEN

Answer explanation

The main component of coal tar is CARBON, which is a key element in its composition.

WHICH PROCESS IS USED TO EXTRACT COAL GAS FROM COAL?

• COMBUSTION

• DESTRUCTIVE DISTILLATION

• PHOTOSYNTHESIS

Answer explanation

DESTRUCTIVE DISTILLATION is the process used to extract coal gas from coal.

WHAT IS THE PRIMARY USE OF COAL GAS?

• HEATING

• COOKING

• ILLUMINATION

Answer explanation

The primary use of coal gas is for heating purposes, making it the correct choice among the options provided.

WHAT IS THE PROCESS OF CONVERTING WOOD INTO COAL OVER MILLIONS OF YEARS?

• CARBONISATION

• DESTRUCTIVE DISTILLATION

• FOSSILIZATION

• PHOTOSYNTHESIS

Answer explanation

The process of converting wood into coal over millions of years is known as carbonisation, where the organic material undergoes transformation into coal due to heat and pressure.

Which of the following is the purest form of carbon?

• Coal gas

• Coal tar

• Coke

• None of the above

Answer explanation

Coke is the purest form of carbon, typically produced from coal. It is the solid carbonaceous material emanated from the destructive distillation of low-sulphur, low-ash bituminous coal. In contrast, coal gas and coal tar contain less carbon content and more impurities.