Question

Name the following:
(i) It is a rock, consisting of hydrated aluminium oxides.
(ii) It makes steel strong, removes impurities and makes it immune to rusting.
(iii) It is based on the use of dung to produce gas which is used as domestic fuel.

Answer 1

Answer:

(i) Bauxite is an important ore which is used for making aluminium. It is an oxide of aluminium. It is not a specific mineral but a rock consisting mainly of hydrated aluminium oxides.

(ii) Deoxidization is a method used in metallurgy to remove the oxygen content during steel manufacturing.

(iii) "Dung cakes", made from the by-products of animal husbandry, are traditionally used as fuel in India for cooking food in a domestic hearth called a Chulha. They are made by hand by village women and are traditionally made from cow or buffalo dung. One dung cake of an average size gives 2100 kJ worth of energy.

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