Which of the following statements is true regarding coal?

Among all the crystalline and amorphous forms of carbon, coal is the purest.

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The destructive distillation of coal gives coke, graphite and soot.

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Coal is formed from the slow decomposition of plants under the influence of pressure and excess oxygen.

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Coal is formed when wood is burnt in excess air.

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Solution

The correct option is C Coal is formed from the slow decomposition of plants under the influence of pressure and excess oxygen.
Coke is the purest form of carbon. Main constituent of coal is carbon and it also contains other impurities like as sulphur, phosphorus, lead, etc.

Some of the important characteristics of coal are:

It is formed by slow decomposition of plants under the influence of pressure and heat in a limited supply of air.

Destructive distillation of coal gives coke, coal gas and coal tar as the main products.

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Similar questions

Choose the correct alternative :

(a) Anthracite is

(i) an inferior type of coal

(ii) a superior type of coal

(iii) the cheapest form of coal

(iv) none of the above

(b) Destructive distillation of coal yields

(i) coal tar

(ii) coal gas

(iii) coke

(iv) all of the above

(i) an amorphous form of carbon

(ii) a crystalline form of carbon

(iii) a pure form of carbon

(iv) a cluster of carbon atoms

(d) The process by which decayed plants slowly convert into coal is called

(i) petrification

(ii) carbonisation

(iii) carbonification

(iv) fermentation

(e) The purest form of the amorphous carbon is

(i) wood charcoal

(ii) sugar charcoal

(iii) bone charcoal

(iv) lamp black

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