Question

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

(c) Lamp black is

(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

Answer 1

(a). Anthracite is a superior type of coal.
(b). Heating coal, in the absence of air, is known as a destructive distillation of coal. It yields various useful products like coke, coal gas, coal tar, and ammoniacal liquor.
(c). Lamp black is an amorphous form of carbon.
(d). The slow process by which the dead plants buried deep under the earth have become coal is called Carbonisation. Since coal was formed from the remains of plants therefore coal is called fossil fuel.
(e). The purest form of amorphous carbon is anthracite.