High purity copper metal is obtained by:
(a) carbon reduction
(b) hydrogen reduction
(c) electrolytic reduction
(d) thermite process
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(C) It is a fact.
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Aluminothermic process is used for the extraction of metals, whose oxides are:
(a) fusible
(b) not easily reduced by carbon
(c) not easily reduced by hydrogen
(d) strongly basic
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(b) Alumino-thermic process is commonly used for those metals which have very high m.pt. and are to be extracted from their oxides and their reduction with carbon is not satisfactory.
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Purest form of iron is:
(a) cast iron
(b) hard steel
(c) stainless steel
(d) wrought iron
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(D) It is a fact.
Difficulty Level:
Thomas slag is:
(a) calcium silicate
(b) calcium phosphate
(c) tricalcium phosphate and calcium silicate
(d) calcium ammonium phosphate
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(c) Thomas slag is tricalcium phosphate and calcium silicate.
Difficulty Level:
Corundum is:
(a) SrO2
(b) Al2O3
(c) CaCl2
(d) Cu2Cl2
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(b) Corundum is a compound of aluminium and consist of crystals of -Al2O3 (rhombic lattice).
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Heating of carbonate ores to remove carbon is called as:
(a) roasting
(b) calcination
(c) smelting
(d) fluxing
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(b) Calcination is a process in which the ore is heated strongly in the absence of air.
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Sulphide ores are common for the metals:
(a) Ag, Cu and Pb
(b) Ag, Cu and Sn
(c) Ag, Mg and Pb
(d) Al, Cu and Pb
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(a) Metals having high polarising power (Zeff) exist in ore with anions having high polarisibility
Ag, Cu, Pb Sulphide ores (Ag2S, CuFeS2, Pbs)
Sn Oxide ore (SnO2)
Mg Sea water and dolomite (CaCO3, MgCO3)
Al Oxide ore (Al2O3.2H2O)
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(b) Sulphur occurs in native state while iodine, phosphorus and magnesium are found in combined state.
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The metal used in storage batteries is:
(a) Cu
(b) Sn
(c) Pb
(d) Ni
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(c) It is one use of lead.
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Silver obtained by argentiferrous lead is purified by:
(a) distillation
(b) froth floatation
(c) cupellation
(d) reacting with KCN
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(c) Lead present as impurity in the silver obtained by argentiferous lead is purified by cupellation.
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