Question 1: Palette 1/23

JEE Advanced 2023 MSQ

The correct statement(s) related to processes involved in the extraction of metals is(are) :

A

Roasting of Malachite produces Cuprite.

B

Calcination of Calamine produces Zincite.

C

Copper pyrites is heated with silica in a reverberatory furnace to remove iron.

D

Impure silver is treated with aqueous $\mathrm{KCN}$ in the presence of oxygen followed by reduction with zinc metal.

Question 2: Palette 2/23

JEE Advanced 2022 MSQ

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range $900-1500 \mathrm{~K}$ is(are)

A

Limestone is used to remove silicate impurity.

B

Pig iron obtained from blast furnace contains about $4 \%$ carbon.

C

Coke (C) converts $\mathrm{CO}_{2}$ to $\mathrm{CO}$.

D

Exhaust gases consist of $\mathrm{NO}_{2}$ and $\mathrm{CO}$.

Question 3: Palette 3/23

JEE Advanced 2022 MSQ

The electrochemical extraction of aluminum from bauxite ore involves

A

the reaction of $\mathrm{Al}_{2} \mathrm{O}_{3}$ with coke $(\mathrm{C})$ at a temperature $>2500^{\circ} \mathrm{C}$.

B

the neutralization of aluminate solution by passing $\mathrm{CO}_{2}$ gas to precipitate hydrated alumina $\left(\mathrm{Al}_{2} \mathrm{O}_{3} \cdot 3 \mathrm{H}_{2} \mathrm{O}\right)$.

C

the dissolution of $\mathrm{Al}_{2} \mathrm{O}_{3}$ in hot aqueous $\mathrm{NaOH}$.

D

the electrolysis of $\mathrm{Al}_{2} \mathrm{O}_{3}$ mixed with $\mathrm{Na}_{3} \mathrm{AlF}_{6}$ to give $\mathrm{Al}$ and $\mathrm{CO}_{2}$.

Question 4: Palette 4/23

JEE Advanced 2021 MSQ

The correct statement(s) related to the metal extraction processes is (are) :

A

A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO₂

B

In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.

C

Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper.

D

In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)₂]

Question 5: Palette 5/23

JEE Advanced 2021 MSQ

A mixture of two salts is used to prepare a solution S, which gives the following results :


The correct option(s) for the salt mixture is (are)

A

Pb(NO₃)₂ and Zn(NO₃)₂

B

Pb(NO₃)₂ and Bi(NO₃)₃

C

AgNO₃ and Bi(NO₃)₃

D

Pb(NO₃)₂ and Hg(NO₃)₂

Question 6: Palette 6/23

JEE Advanced 2020 MSQ

Which among the following statement(s) is/are true for the extraction of aluminium from bauxite?

A

Hydrated Al₂O₃ precipitates, when CO₂ is bubbled through a solution of sodium aluminate.

B

Addition of Na₃AlF₆ lowers the melting point of alumina.

C

CO₂ is evolved at the anode during electrolysis.

D

The cathode is a steel vessel with a lining or carbon.

Question 7: Palette 7/23

JEE Advanced 2019 MSQ

The cyanide process of gold extraction involves leaching out gold from its ore with CN^$-$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s).

A

Q is O₂

B

Z is [Zn(CN)₄]^2$-$

C

T is Zn

D

R is [Au(CN)₄]^$-$

Question 8: Palette 8/23

JEE Advanced 2019 MCQ

Calamine, malachite, magnetic and cryolite, respectively, are

A

ZnCO₃, CuCO₃, Fe₂O₃, Na₃AlF₆

B

ZnSO₄, CuCO₃, Fe₂O₃, AlF₃

C

ZnSO₄, Cu(OH)₂, Fe₃O₄, Na₃AlF₆

D

ZnCO₃, CuCO₃.Cu(OH)₂, Fe₃O₄, Na₃AlF₆

Question 9: Palette 9/23

JEE Advanced 2016 MSQ

Extraction of copper from copper pyrite (CuFeS₂) involves

A

crushing followed by concentration of the ore by froth flotation

B

removal of iron as slag

C

self-reduction step to produce ‘blister copper’ following evolution of SO₂

D

refining of ‘blister copper’ by carbon reduction

Question 10: Palette 10/23

JEE Advanced 2015 MSQ

Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is(are)

A

Impure Cu strip is used as cathode

B

Acidified aqueous CuSO₄ is used as electrolyte

C

Pure Cu deposits at cathode

D

Impurities settle as anode – mud

Question 11: Palette 11/23

JEE Advanced 2015 MCQ

Match the anionic species given in Column-I that are present in the ore(s) given in Column-II

Column - I	Column - II
(A) Carbonate	(p) Siderite
(B) Sulphide	(q) Malachite
(C) Hydroxide	(r) Bauxite
(D) Oxide	(s) Calamine
	(t) Argentite

A

(A) $\to$ p,q,s; (B) $\to$ t; (C) $\to$ q,r; (D) $\to$ r

B

(A) $\to$ s; (B) $\to$ s,t; (C) $\to$ r; (D) $\to$ r,s

C

(A) $\to$ p,s; (B) $\to$ s,t; (C) $\to$ r; (D) $\to$ s

D

(A) $\to$ p,q,s; (B) $\to$ s,t; (C) $\to$ p,r; (D) $\to$ t

Question 12: Palette 12/23

JEE Advanced 2013 MSQ

The carbon–based reduction method is NOT used for the extraction of

A

tin from SnO₂

B

iron from Fe₂O₃

C

aluminium from Al₂O₃

D

magnesium from MgCO₃.CaCO₃

Question 13: Palette 13/23

JEE Advanced 2013 MCQ

Sulphide ores are common for the metals

A

Ag, Cu and Pb

B

Ag, Mg and Pb

C

Ag, Cu and Sn

D

Al, Cu and Pb

Question 14: Palette 14/23

JEE Advanced 2012 MCQ

In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are

A

O₂ and CO respectively

B

O₂ and Zn dust respectively

C

HNO₃ and Zn dust respectively

D

HNO₃ and CO respectively

Question 15: Palette 15/23

JEE Advanced 2011 MSQ

Extraction of metal from the ore cassiterite involves

A

carbon reduction of an oxide ore

B

self-reduction of a sulphide ore

C

removal of copper impurity

D

removal of iron impurity

Question 16: Palette 16/23

JEE Advanced 2011 MCQ

Oxidation states of the metal in the minerals haematite and magnetite, respectively are

A

II, III in haematite and III in magnetite

B

II, III in haematite and II in magnetite

C

II in haematite and II, III in magnetite

D

III in haematite and II, III in magnetite

Question 17: Palette 17/23

JEE Advanced 2010 MCQ

Partial roasting of chalcopyrite produces

A

Cu$_2$S and FeO

B

Cu$_2$O and FeO

C

CuS and Fe$_2$O$_3$

D

Cu$_2$O and Fe$_2$O$_3$

Question 18: Palette 18/23

JEE Advanced 2010 MCQ

Iron is removed from chalcopyrite as

A

FeO

B

FeS

C

Fe$_2$O$_3$

D

FeSiO$_3$

Question 19: Palette 19/23

JEE Advanced 2010 MCQ

In self-reduction, the reducing species is

A

S

B

O$^{2-}$

C

S$^{2-}$

D

SO$_2$

Question 20: Palette 20/23

JEE Advanced 2008 MCQ

Match the conversions in Column I with the type(s) of reaction(s) given in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 $\times$ 4 matrix given in the ORS.

	Column I		Column II
(A)	PbS $\to$ PbO	(P)	roasting
(B)	CaCO$_3$ $\to$ CaO	(Q)	Calcination
(C)	ZnS $\to$ Zn	(R)	carbon reduction
(D)	Cu$_2$S $\to$ Cu	(S)	self reduction

A

A $\to$ (p); B $\to$ (q); C $\to$ (p); D $\to$ (s)

B

A $\to$ (q); B $\to$ (p); C $\to$ (r); D $\to$ (p, s)

C

A $\to$ (p); B $\to$ (q); C $\to$ (p, r); D $\to$ (p, s)

D

A $\to$ (p); B $\to$ (q, s); C $\to$ (p, r); D $\to$ (p)

Question 21: Palette 21/23

JEE Advanced 2008 MCQ

Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of:

A

nitrogen

B

oxygen

C

carbon dioxide

D

argon

Question 22: Palette 22/23

JEE Advanced 2007 MCQ

Extraction of zinc from zinc blende is achieved by

A

electrolytic reduction

B

roasting followed by reduction with carbon

C

roasting followed by reduction with another metal

D

roasting followed by self-reduction

Question 23: Palette 23/23

JEE Advanced 2006 MCQ

Match the extraction processes listed in Column I with metals listed in Column II.

Column I		Column II
(A)	Self-reduction	(P)	Lead
(B)	Carbon reduction	(Q)	Silver
(C)	Complex formation and displacement by metal	(R)	Copper
(D)	Decomposition of iodide	(S)	Boron

A

$ [\mathrm{A} \rightarrow(\mathbf{P}, \mathbf{R}) ; \mathbf{B} \rightarrow(\mathbf{P}, \mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{Q}) ; \mathrm{D} \rightarrow(\mathrm{~S})] .$

B

$ [\mathrm{A} \rightarrow(\mathbf{P}) ; \mathbf{B} \rightarrow(\mathbf{P}, \mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{Q}) ; \mathrm{D} \rightarrow(\mathrm{~S})] .$

C

$ [\mathrm{A} \rightarrow(\mathbf{P}, \mathbf{R}) ; \mathbf{B} \rightarrow(\mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{Q}) ; \mathrm{D} \rightarrow(\mathrm{~S})] .$

D

$ [\mathrm{A} \rightarrow(\mathbf{P}, \mathbf{R}) ; \mathbf{B} \rightarrow(\mathbf{P}, \mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{S}) ; \mathrm{D} \rightarrow(\mathrm{Q})] .$