Which of the following statements are correct?
(I) Coal, petroleum and natural gas are called fossil fuels.
(II) Coal and natural gas are exhaustible substances.
(III) is more polluting than petrol.
(IV) Coke is used in the manufacture of steel.
Important Questions on Coal and Petroleum
Few statements are given below. Identify the incorrect statements and mark the appropriate option.
(i) In the fractional distillation of petroleum, a hydrocarbon with the lowest boiling point condenses first.
(ii) Useful substances obtained from petroleum and natural gas are termed as 'Petrochemicals'.
(iii) Coke is used in the extraction of many metals.
(iv) Paraffin wax used in candles, Vaseline, grease, polish is obtained by destructive distillation of coal.
Read the given passage and fill in the blanks by selecting an appropriate option.
The process of conversion of wood into coal is called i There are three main varieties of coal that vary in their carbon content. has up to per cent of carbon, has about per cent carbon while iv has about per cent carbon.
(i) Bitumen is used for metalling the roads.
(ii) Some inexhaustible natural resources like coal, petroleum and natural gas formed from the dead remains of living organisms are known as fossil fuels.
(iii) Many useful substances are obtained from coal (commercial importance), so it is also called 'Black gold'.
(iv) Natural gas is used as a starting material for the manufacture of a number of chemicals and fertilisers.
