The material A is a fossil fuel which is extracted from the earth. It is said to be formed from the buried large land plants by a very slow process B. When A is heated in the absence of air in a process called C then it gives three products, D, E and F. The product D is used as a reducing agent in the extraction of metals, the product E is used as and industrial fuel whereas the product F has been traditionally used for metalling the roads.

(a) What could material A be ?

(b) What is (i) physical state, and (ii) colour, of A ?

(c) Name the processes (i) B, and (ii) C.

(d) What are (i) D, (ii) E, and (iii) F ?

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Solution

(a) Coal (b) (i) Solid (ii) Black (c) (i) Carbonisation (ii) Destructive distillation (d) (i) Coke (ii) Coal gas (iii) Coal tar

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(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A.Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.

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(a) What type of change occurs when solid A is dissolved in water ? Why ?

(b) What type of change occurs when solid D is dissolved in water ? Why ?

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(e) Name the process by which D can be recovered from E.

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