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
Answers Key
1.(a)
2.(c)
3.(b)
4.(b)
5.(c)
6.(b)
7.(b)
8.(d)
9.(c)
10.(c)
1.(a)
2.(c)
3.(b)
4.(b)
5.(c)
6.(b)
7.(b)
8.(d)
9.(c)
10.(c)
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