Question

a. Alloy of sodium with mercury

b. Molecular formula of the common ore
of aluminium.

c. The oxide that forms salt and water by reacting with both acid and base.

d. The device used for grinding an ore.nonmetal having electrical conductivity.

f. The reagent that dissolves noble metals.
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Answer 1

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(a.) Sodium amalgam [Na(Hg)]

(b.) Bauxite (Al2O3. 2H2O) is the common ore of aluminium.

(c.) Amphoteric oxides - for example :-lead oxide and zinc oxide

(d.) Ball mill

(e.) Graphite

(f.) Regal water or king's water or aqua regia (mixture of nitric acid and hydrochloric acid in a molar ratio of 1:3)

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