Match the given terms used in metallurgy (Column I) with their respective meanings (Column II).

I II

a. Roasting i. Unwanted impurities present in the ore

b. Flux ii. Heating ore just below its melting point in excess of air

c. Gangue iii. Substance added to ores in order to remove impurities

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Solution

Correct answer is option (b).

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Column I	Column II
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Column I	Column II	Column III
1. Bulb	(a) Figure	(i) Has a coiled tungsten filament.
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4. Cell	(d) Figure	(iv) Used to close or open an electric circuit.
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(a) Give the chemical names and formulae of main ores of (i) aluminium (ii) iron (iii) zinc.

(b) Which impurities are present in bauxite.

C a O

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I	II
a. Roasting	i. Unwanted impurities present in the ore
b. Flux	ii. Heating ore just below its melting point in excess of air
c. Gangue	iii. Substance added to ores in order to remove impurities