Coal and Petrol...

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) CNG is more polluting than petrol.
(IV) Coke is used in the manufacture of steel.

When air is passed through red hot coke, a gaseous fuel is produced. The name of this gaseous fuel and its composition are respectively

Destructive distillation of coal is carried out by heating coal strongly to 1000^∘C in the absence of air. The various useful products obtained are

Few statements are given below. Identify the incorrect statements and mark the appropriate option.

(i)  in fractional distillation of petroleum, hydrocarbon with 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.
 

In the oil wells, X forms the topmost layer, followed by Y and finally Z. X, Y and Z are respectively

Read the given passage and fill in the blanks by choosing an appropriate option.

The process of conversion of wood into coal is called ___i___. There are three main varieties of coal which vary in their carbon content. ___ii___ has upto 96 per cent of carbon, ___iii___ has about 65 per cent carbon while ___iv___ has about 38 per cent carbon.

In fractionating column, various fractions are obtained at various heights of the column. As the vapours reach at a height where temperature is equal to or just below the boiling point of that fraction, it will

Select the incorrect statements among the following:

(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 as 'Black gold'.
(iv) Natural gas is used as a starting material for the manufacture of a number of chemicals and fertilisers.

Which of the following represents the correct decreasing order of boiling points of the given liquids.

Different components of petroleum are separated by fractional distillation. What is the correct sequence of fractions obtained in the fractionating column from top to bottom?