Bauxite has the composition ______.

(a)

Al₂O₃

(b)

Al₂O₃.nH₂O

(c)

Fe₂O₃.2H₂O

(d)

None of these

Which of the metal is extracted by Hall-Heroult process?

(a)

Al

(b)

Ni

(c)

Cu

(d)

Zn

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

(a)

A	B	C	D
(i)	(ii)	(iii)	(iv)

(b)

A	B	C	D
(iii)	(iv)	(v)	(i)

(c)

A	B	C	D
(iv)	(ii)	(iii)	(i)

(d)

A	B	C	D
(ii)	(iii)	(i)	(v)

Which one of the following is not feasible

(a)

Zn_(s) + Cu²⁺_(aq) \(\rightarrow\) Cu_(s) + Zn²⁺_(aq)

(b)

Cu_(s)+ Zn²⁺_(aq)\(\rightarrow\) Zn_(s) + Cu²⁺_(aq)

(c)

Cu_(s) + 2Ag⁺_(ag)\(\rightarrow\) 2Ag_(s) + Cu²⁺_(aq)

(d)

Fe_(s) + Cu²⁺_(aq) \(\rightarrow\) Cu_(s)+ Fe²⁺_(aq)

Flux is a substance which is used to convert_______.

(a)

Mineral into silicate

(b)

Infusible impurities to soluble impurities

(c)

Soluble impurities to infusible impurities

(d)

All of these

In the extraction of aluminium from alumina by electrolysis, cryolite is added to_______.

(a)

Lower the melting point of alumina

(b)

Remove impurities from alumina

(c)

Decrease the electrical conductivity

(d)

Increase the rate of reduction

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? 

(a)

Fe

(b)

Cu

(c)

Mg

(d)

Zn

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 commonly used to produce foam in froth floatation process?

(a)

Pine oil

(b)

Cresol

(c)

NaCN

(d)

Xanthate

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

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

(a)

Zinc blende

(b)

Aragonite

(c)

Dolomite

(d)

Carnallite

Concentration of copper glance is done by________.

(a)

leaching

(b)

magnetic separation

(c)

froth flotation

(d)

hydraulic washing

Sodium magnesium and aluminum can be obtained from their ore by________.

(a)

electro metallurgy

(b)

pyro metallurgy

(c)

hydro metallurgy

(d)

smelting

\(\Delta { G }^{ o }\) vs T plot in the Ellingham's diagram slopes downward the reaction ________.

(a)

\(Mg+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow MgO\)

(b)

\(C+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow CO\)

(c)

\(2Ag+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow { Ag }_{ 2 }O\)

(d)

\(2Ag+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow { Ag }_{ 2 }O\)

Sulphide ore is converted to oxide form by using the process________.

(a)

Calcination

(b)

Roasting

(c)

Smelting

(d)

Leaving

\({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2A{ { u }_{ (s) } }\) In the above equation the oxidation state of metallic gold is_______

(a)

1

(b)

0

(c)

+2

(d)

-2

In the metallurgy of iron, limestone is added to coke. Which acts as a_______

(a)

Reducing agent

(b)

Oxidising agent

(c)

Slag

(d)

Flux

Cinnabar is the sulphide ore of _________ metal.

(a)

Zn

(b)

Pb

(c)

Hg

(d)

Ag

Metal oxide is converted into metal by the _______ process.

(a)

Calcination

(b)

roasting

(c)

smelting

(d)

bessemerisation

\(HgS_{ (s) }+{ O }_{ 2(g) }\longrightarrow { Hg }_{ (l) }+{ SO }_{ 2 }\uparrow \) The above reaction is an example of _________reduction.

(a)

metal

(b)

hydrogen

(c)

carbon

(d)

auto