Purest form of iron is:

(a) cast iron

(b) hard steel

(c) stainless steel

(d) wrought iron

Concept Questions :-

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

(a) calcium silicate

(b) calcium  phosphate

(c) tricalcium phosphate and calcium silicate

(d) calcium ammonium phosphate

Concept Questions :-

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

(a) SrO2

(b) Al2O3

(c) CaCl2

(d) Cu2Cl2

 

Concept Questions :-

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

(a) roasting

(b) calcination

(c) smelting

(d) fluxing

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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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

Concept Questions :-

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

(a) Iodine

(b) Sulphur

(c) Phosphorus

(d) Magnesium

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The metal used in storage batteries is:

(a) Cu

(b) Sn

(c) Pb

(d) Ni

Concept Questions :-

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

(a) distillation

(b) froth floatation

(c) cupellation

(d) reacting with KCN

Concept Questions :-

Refining Process
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Which process is not used in purification of bauxite?

(a) Hall's method

(b) Baeyer's method

(c) Serpek's method

(d) Frankland's method

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Chloride ore among the following is:

(a) malachite

(b) magnesite

(c) magnetite

(d) Karnalite

Concept Questions :-

Intro - Flux, Leaching, Roasting & Calcination
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