Q16Multiple choice
Fill in the blanks in the following sentences.
- (a)Coal is one of the ________ used to cook food.
- (b)When heated in air, coal burns and produces mainly ________ gas.
- (c)Coal tar is a black, thick ________ with an ________ smell.
- (d)Petroleum, ________ and ________ are fossil fuels. (e) Forests and coal are ________ natural resources. 26 E XEMPLAR PROBLEMS
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(a) Coal is one of the ________ used to cook food.
(d) Petroleum, ________ and ________ are fossil fuels. (e) Forests and coal are ________ natural resources. 26 E XEMPLAR PROBLEMS
(b) When heated in air, coal burns and produces mainly ________ gas.
(c) Coal tar is a black, thick ________ with an ________ smell.