1. The compound of a metal found in nature is called____
(a) mineral
(b) ore
(c) flux
(d) slag
2. A naturally occurring substance from which a metal can be profitably extracted is called____
(a) mineral
(b) gangue
(c) ore
(d) flux
3. Rocky impurities present in a mineral are called____
(a) flux
(b) gangue
(c) matte
(d) slag
4. The froth floation process is used for the concentration of____
(a) oxide ores
(b) sulphide ores
(c) halide ores
(d) silicate ores
5. Copper pyrites (CuFeS_2) are concentrated by____
(a) electromagnetic method
(b) gravity method
(c) froth floatation method
(d) all of above methods
6. Cyanide process is used for extraction of____
(a) Ag
(b) Au
(c) Cu
(d) Zn
7. The most abundant element or earth curst is____
(a) hydrogen
(b) oxygen
(c) silicon
(d) carbon
8. Iron ore is concentrated by____
(a) froth floation
(b) electrolysis
(c) roasting
(d) magnetic treatment
9. The magnetic separation is used for increasing concentration of the following____
(a) horn silver
(b) calcite
(c) haematite
(d) magnesite
10. The oil used in the floatation method for the purification of ores is____
(a) coconut oil
(b) olive oil
(c) pine oil
(d) none
Note : Answers will be updated soon....
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