High purity copper metal is obtained by:

(1) carbon reduction

(2) hydrogen reduction

(3) electrolytic reduction

(4) thermite process

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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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

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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Purest form of iron is:

(1) cast iron

(2) hard steel

(3) stainless steel

(4) wrought iron

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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Thomas slag is:

(1) calcium silicate

(2) calcium  phosphate

(3) tricalcium phosphate and calcium silicate

(4) calcium ammonium phosphate

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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Corundum is:

(1) SrO2

(2) Al2O3

(3) CaCl2

(4) Cu2Cl2

 

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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Heating of carbonate ores to remove carbon is called as:

(1) roasting

(2) calcination

(3) smelting

(4) fluxing

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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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

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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Which element occurs freely in nature?

(1) Iodine

(2) Sulphur

(3) Phosphorus

(4) Magnesium

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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The metal used in storage batteries is:

(1) Cu

(2) Sn

(3) Pb

(4) Ni

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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Silver obtained by argentiferrous lead is purified by:

(1) distillation

(2) froth floatation

(3) cupellation

(4) reacting with KCN

Concept Questions :-

Refining Process
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