Core Syllabus Module

Metallurgy

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Chapter Elite-20 Challenge Zone

Target Advanced

JEE Main 2021

LEVELJEE Advanced

The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates.

(A)

Δ G = 0

and melting or boiling point of the metal oxide

(B)

Δ G > 0

and decomposition of the metal oxide

(C)

Δ G < 0

and decomposition of the metal oxide

(D)

Δ G = 0

and reduction of the metal oxide

JEE Main 2014

LEVELJEE Advanced

Which series of reactions correctly represent chemical relations related to iron and its compound?

(A)

Fe Dil. H_{2} SO_{4} FeSO_{4} H_{2} SO_{4}, O_{2} Fe_{2} (SO_{4})_{3} Heat Fe

(B)

Fe O_{2}, heat FeO dil. H_{2} SO_{4} FeSO_{4} Heat Fe

(C)

Fe Cl_{2}, heat FeCl_{3} Heat, air FeCl_{2} Zn Fe

(D)

Fe O_{2}, heat Fe_{3} O_{4} CO, 60 0^{\circ} C FeO CO, 70 0^{\circ} C Fe

JEE Advanced 2020

LEVELJEE Main

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

* Multiple Correct Options

(A)

Hydrated

Al_{2} O_{3}

precipitates, when

CO_{2}

is bubbled through a solution of sodium aluminate.

(B)

Addition of

Na_{3} AlF_{6}

lowers the melting point of alumina.

(C)

CO_{2}

is evolved at the anode during electrolysis.

(D)

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

JEE Advanced 2023

LEVELJEE Main

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

* Multiple Correct Options

(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 KCN in the presence of oxygen followed by reduction with zinc metal.

JEE Advanced 2019

LEVELJEE Main

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).

* Multiple Correct Options

(A)

T

Zn

(B)

R

[Au (CN)_{4}]^{-}

(C)

Z

[Zn (CN)_{4}]^{2 -}

(D)

Q

O_{2}

JEE Advanced 2021

LEVELJEE Main

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

* Multiple Correct Options

(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].

JEE Advanced 2016

LEVELJEE Main

Extraction of copper from copper pyrite ( $CuFeS_{2}$ ) involves

* Multiple Correct Options

(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' follwoing evolution of

SO_{2}

(D)

refining of 'blister copper' by carbon reduction

JEE Main 2019

LEVELJEE Main

The correct statement regarding the given Ellingham diagram is

(A)

80 0^{\circ} C

, Cu can be used for the extraction of Zn from ZnO

(B)

140 0^{\circ} C

, Al can be used for the extraction of Zn from ZnO

(C)

50 0^{\circ} C

, coke can be used for the extraction of Zn from ZnO

(D)

Coke cannot be used for the extraction of Cu from

Cu_{2} O

JEE Advanced 2022

LEVELJEE Main

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

* Multiple Correct Options

(A)

Limestone is used to remove silicate impurity.

(B)

Pig iron obtained from blast furnace contains about

4%

carbon.

(C)

Coke (C) converts

CO_{2}

CO

(D)

Exhaust gases consist of

NO_{2}

and

CO

JEE Advanced 2018

LEVELJEE Main

Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnance such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of O $_{2}$ consumed is ______ . (Atomic weights in g mol $^{- 1}$ : O = 16, S = 32, Pb = 207)

JEE Advanced 2015

LEVELJEE Main

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

* Multiple Correct Options

(A)

Impure Cu strip is used as cathode

(B)

Acidified aqueuous

CuSO_{4}

is used as electrolyte

(C)

Pure Cu deposits at cathode

(D)

Impurities settle as anode-mud

JEE Advanced 2022

LEVELJEE Main

The electrochemical extraction of aluminum from bauxite ore involves.

* Multiple Correct Options

(A)

the reaction of

Al_{2} O_{3}

with coke (C) at a temperature

> 250 0^{\circ} C

(B)

the neutralization of aluminate solution by passing

CO_{2}

gas to precipitate hydrated alumina (

Al_{2} O_{3} \cdot 3 H_{2} O

(C)

the dissolution of

Al_{2} O_{3}

in hot aqueous NaOH.

(D)

the electrolysis of

Al_{2} O_{3}

mixed with

Na_{3} AlF_{6}

to give Al and

CO_{2}

JEE Main 2021

LEVELJEE Main

Given below are two statements. Statement I The choice of reducing agent for metals extraction can be made by using Ellingham diagram, a plot of $Δ G$ vs temperature. Statement II The value of $Δ S$ increases from left to right in Ellingham diagram. In the light of the above statements, choose the most appropriate answer from the options given below.

(A)

Both statement I and statement II are true.

(B)

Statement I is false but statement II is true.

(C)

Both statement I and statement II are false.

(D)

Statement I is true but statement II is false.

JEE Main 2021

LEVELJEE Main

Match List-I with List-II. \begin{array}{ll} \text{\textbf{List-I}} & \text{\textbf{List-II}} \\ \text{A. Mercury} & \text{1. Vapour phase refining} \\ \text{B. Copper} & \text{2. Distillation refining} \\ \text{C. Silicon} & \text{3. Electrolytic refining} \\ \text{D. Nickel} & \text{4. Zone refining} \end{array} Choose the most appropriate answer from the options given below.

(A)

\to

1, B

\to

4, C

\to

2, D

\to

(B)

\to

2, B

\to

3, C

\to

1, D

\to

(C)

\to

2, B

\to

3, C

\to

4, D

\to

(D)

\to

2, B

\to

4, C

\to

3, D

\to

JEE Main 2019

LEVELJEE Main

Match the refining methods Column I with metals Column II. $Column I (Refining Methods) I. Liquation II. Zone refining III. Mond process IV. van Arkel method Column II (Metals) (A) Zr (B) Ni (C) Sn (D) Ga$

(A)

I-(C); II-(D); III-(B); IV-(A)

(B)

I-(B); II-(C); III-(D); IV-(A)

(C)

I-(C); II-(A); III-(B); IV-(D)

(D)

I-(B); II-(D); III-(A); IV-(C)

JEE Main 2019

LEVELJEE Main

With respect to an ore, Ellingham diagram helps to predict the feasibility of its

vapour phase refining

In the electrolytic refining of blister copper, the total number of main impurities from the following, removed as anode mud is …… Pb, Sb, Se, Te, Ru, Ag, Au and Pt

LEVELJEE Main

Which method of purification is represented by the following equation? $Ti (s) + 2 I_{2} (g) 523 K TiI_{4} (g) 1700 K Ti (g) + 2 I_{2} (g)$

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) Aluminium is extracted from bauxite by the electrolysis of molten mixture of $Al_{2} O_{3}$ with cryolite. Reason (R) The oxidation state of Al in cryolite is $+ 3$ . In the light of the above statements, choose the most appropriate answer from the options given below.

(A)

(A) is true but (R) is false

(B)

(A) is false but (R) is true.

(C)

Both (A) and (R) are true and (R) is the correct explanation of (A).

(D)

Both (A) and (R) are true but (R) is not the correct explanation of (A).

JEE Main 2019

LEVELJEE Main

Match the ores (Column A) with the metals (Column B). \begin{array}{llll} \hline & \text{Column A (Ores)} & & \text{Column B (Metals)} \\ \hline \text{A.} & \text{Siderite} & \text{P.} & \text{Zinc} \\ \text{B.} & \text{Kaolinite} & \text{Q.} & \text{Copper} \\ \text{C.} & \text{Malachite} & \text{R.} & \text{Iron} \\ \text{D.} & \text{Calamine} & \text{S.} & \text{Aluminium} \\ \hline \end{array}

(A)

A - P; B- Q; C - R; D- S

(B)

A - R; B- S; C - P; D- Q

(C)

A - Q; B- R; C - S; D- P

(D)

A - R; B- S; C - Q; D- P

Micro-Topic Strategy Matrix

Ores

Principles of Metallurgy and Extraction

Refining of Metals

Chapter Elite-20 Challenge Zone

The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates.

Which series of reactions correctly represent chemical relations related to iron and its compound?

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

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

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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Extraction of copper from copper pyrite (CuFeS2​) involves

The correct statement regarding the given Ellingham diagram is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range 900−1500 K is(are)

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

The electrochemical extraction of aluminum from bauxite ore involves.

With respect to an ore, Ellingham diagram helps to predict the feasibility of its

In the electrolytic refining of blister copper, the total number of main impurities from the following, removed as anode mud is …… Pb, Sb, Se, Te, Ru, Ag, Au and Pt

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Which method of purification is represented by the following equation? Ti (s)+2I2​(g)523 K​TiI4​(g)1700 K​Ti (g)+2I2​(g)

Extraction of copper from copper pyrite ( $CuFeS_{2}$ ) involves

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

Which method of purification is represented by the following equation? $Ti (s) + 2 I_{2} (g) 523 K TiI_{4} (g) 1700 K Ti (g) + 2 I_{2} (g)$