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CHAPTER 3 : Metals and Non-metals-2
GHS (RMSA) THORALAKKI, MALUR TALUK, KOLAR DISTRICT
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1) Metallurgy involves :
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(a) Concentration of ore
(b) Reduction of ore
(c) Purification
(d) Alloy formation
(e) All the above
2) Which of the following is true ?
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(a) A mineral need not be an ore
(b) An ore can't be a mineral
(c) All ores are not minerals
(d) All minerals are ores
3) Which one of the following is not a method of concentration of ore :
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(a) Gravity Separation
(b) Froth flotation process
(c) Electromagnetic separation
(d) Smelting
4) During extraction of a metal the ore is roasted if it is a :
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(a) Sulphide ore
(b) Sulphate ore
(c) Carbonate ore
(d) Oxide ore
5) A common metal that is used for the extraction of some metals from their oxides is :
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(a) Cr
(b) Fe
(c) Al
(d) Mn
6) During smelting an additional substance added to form a fusible product. It is known as :
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(a) Slag
(b) Mud
(c) Gangue
(d) Flux
7) Calcination is the process of heating the ore :
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(a) In inert gas
(b) In the presence of air
(c) In the absence or limited supply of air
(d) In the presence of CO₂
8) Roasting is carried out in the case of :
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(a) Galena (PbS)
(b) Iron pyrites (FeS₂)
(c) Copper glance (Cu₂S)
(d) All the above
9) Which of the following metals are extracted by electrolytic reduction ?
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(a) Cu & Ag
(b) Mg & Al
(c) Fe & Zn
(d) Ni & Hg
10) Slag is a product of :
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(a) Flux & coke
(b) Coke & Metal oxide
(c) Flux & Impurities
(d) Metal & Flux
11) Auto-reduction process is used for the extraction of :
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(a) Copper
(b) Mercury
(c) Lead
(d) All the above
12) On heating a mixture of Cu₂O and Cu₂S, we get :
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(a) Cu + SO₂
(b) Cu + SO₃
(c) CuO + CuS
(d) CuSO₄
13) Which of the following cannot be reduced to metal by carbon ?
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(a) ZnO
(b) CuO
(c) MgO
(d) Fe₂O₃
14) Metals that do not form oxides are :
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(a) K & Na
(b) Fe & Pb
(c) H & Cu
(d) Pt & Au
15) Metal that cannot be reduced by common reducing agents like C, CO & H₂ is :
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(a) Mg
(b) Zn
(c) Cu
(d) Fe
16) Chemical formula of compound formed by rusting of copper metal is :
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(a) CuCO₃ Cu(OH)₂
(b) CuCO₃
(c) Cu(OH)₂
(d) CuCO₃ H₂O
17) Galvanization is applying a coating of :
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(a) Zn
(b) Pb
(c) Cr
(d) Cu
18) Extraction of metals from sulphide ores is done by:
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(a) Electrolysis
(b) Smelting
(c) Hydrometallurgy
(d) Roasting
19) Assertion(A) : Roasting is a process in which the ore is heated in presence of air. Reason(R) : Concentration of sulphide ore is done by calcination method.
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(a) Both A and R are true R is the correct explanation of A
(b) Both A and R are true R is not correct explanation of A
(c) A is correct and R is incorrect
(d) A is incorrect and R is correct
20) Assertion(A) : Au, Pt, Ag, etc... are found in native state. Reason(R) : The metals which are noble and chemically less reactive are found in native state.
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(a) Both A and R are true R is the correct explanation of A
(b) Both A and R are true R is not correct explanation of A
(c) A is correct and R is incorrect
(d) A is incorrect and R is correct
Activity series : Relative reactivities of metals :
GOPALA RAO C K
GHS (RMSA) THORALAKKI, MALUR TALUK, KOLAR DISTRICT 563137
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