High purity copper metal is obtained by:
(1) carbon reduction
(2) hydrogen reduction
(3) electrolytic reduction
(4) thermite process
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Aluminothermic process is used for the extraction of metals, whose oxides are:
(1) fusible
(2) not easily reduced by carbon
(3) not easily reduced by hydrogen
(4) strongly basic
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Purest form of iron is:
(1) cast iron
(2) hard steel
(3) stainless steel
(4) wrought iron
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Thomas slag is:
(1) calcium silicate
(2) calcium phosphate
(3) tricalcium phosphate and calcium silicate
(4) calcium ammonium phosphate
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Corundum is:
(1) SrO2
(2) Al2O3
(3) CaCl2
(4) Cu2Cl2
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Heating of carbonate ores to remove carbon is called as:
(1) roasting
(2) calcination
(3) smelting
(4) fluxing
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Sulphide ores are common for the metals:
(1) Ag, Cu and Pb
(2) Ag, Cu and Sn
(3) Ag, Mg and Pb
(4) Al, Cu and Pb
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Which element occurs freely in nature?
(1) Iodine
(2) Sulphur
(3) Phosphorus
(4) Magnesium
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The metal used in storage batteries is:
(1) Cu
(2) Sn
(3) Pb
(4) Ni
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Silver obtained by argentiferrous lead is purified by:
(1) distillation
(2) froth floatation
(3) cupellation
(4) reacting with KCN
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