Cupellation is a process used for the refining of________.

(a)

Silver

(b)

Lead

(c)

Copper

(d)

iron

Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

(a)

Mg

(b)

Zn

(c)

Cr

(d)

Co

Which of the following is not a mineral of aluminium?

(a)

Bauxite

(b)

Cryolite

(c)

China clay

(d)

Malachite

Which of the following is commonly used to produce foam in froth floatation process?

(a)

Pine oil

(b)

Cresol

(c)

NaCN

(d)

Xanthate

Among the following, one does not belong to calcination, Pick the odd one out.

(a)

\({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)

(b)

\({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)

(c)

\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)

(d)

\({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

(a)

Zone of combustion : \(C+{ O }_{ 2 }\rightarrow { CO }_{ 2 }\)

(b)

Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)

(c)

Zone of slag formation : \(CaO+{ SiO }_{ 2 }\rightarrow CaSiO_{ 3 }\)

(d)

Zone of reduction : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)

Name the process by which elements such as germanium, silicon and gallium are refined.

(a)

Vapour phase method

(b)

Electrolytic refining

(c)

Zone refining

(d)

Van-Arkel method

Which of the following will give respective metal by self reduction?

(a)

Galena (Pbs)

(b)

HgS

(c)

ZnS

(d)

Both (a) & (b)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.

(a)

Iron sulphide (FeS)

(b)

Carbon monoxide (CO)

(c)

Copper (I) sulphide (Cu₂S)

(d)

Sulphur dioxide (SO₂)

Which among the following reaction represents the formation of slag?

(a)

\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)

(b)

\({ 2C }_{ (s) }+{ O }_{ 2(g) }\longrightarrow { 2CO }_{ (g) }\)

(c)

\({ Fe }_{ 2 }{ O }_{ 3 }+{ 3CO }_{ (g) }\longrightarrow 2{ Fe }_{ (g) }+{ 3CO }_{ 2(g) }\)

(d)

\({ CaCO }_{ 3(g) }\longrightarrow { CaO }_{ (s) }+{ CO }_{ 2(g) }\)

Which one of the following element is present as a impurity in pig iron?

(a)

Phosphorus

(b)

Manganese

(c)

Carbon

(d)

Silicon

Which of the following mineral contains calcium as well as magnesium?

(a)

Zinc blende

(b)

Aragonite

(c)

Dolomite

(d)

Carnallite

In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

(a)

Non-wettability of the mineral particles in froth.

(b)

Non-wettability of the mineral particles in water

(c)

Non-wettability of the gangue particles in froth

(d)

Non-wettability of the gangue particles in water

Concentration of copper glance is done by________.

(a)

leaching

(b)

magnetic separation

(c)

froth flotation

(d)

hydraulic washing

Identify the decreasing order of carbon content in different forms of iron________.

(a)

Wrought iron > Pig iron > cast iron

(b)

Cast iron > Pig iron > Wrought iron

(c)

Pig iron > Cast iron > Wrought iron

(d)

Cast iron > Wrought iron > Pig iron