General Principles and Processes of Isolation of Metals — JEE Main PYQs

The molar mass of the water insoluble product formed from the fusion of chromite ore $\left({\mathrm{FeCr}}_2{\mathrm{O}}_4\right)$ with ${\mathrm{Na}}_2{\mathrm{CO}}_3$ in presence of ${\mathrm{O}}_2$ is ______ $\mathrm{g}{\mathrm{mol}}^{-1}$.

In Hall - Heroult process, the following is used for reducing ${\mathrm{Al}}_2{\mathrm{O}}_3$ :-

Which of the following metals can be extracted through alkali leaching technique?

Which of the following is used as a stabilizer during the concentration of sulphide ores?

In the extraction process of copper, the product obtained after carrying out the reactions
(i) $2{\mathrm{Cu}}_2\mathrm{S}+3{\mathrm{O}}_2\to 2{\mathrm{Cu}}_2\mathrm{O}+2{\mathrm{SO}}_2$
(ii) …

Given below are two statements :

Statement-I : In the metallurgy process, sulphide ore is converted to oxide before reduction.

Statement-II : Oxide ores in general are easier to reduce.

In the light of the above statements, choose the most appropriate answer from the options g …

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In the Ellingham diagram, a sharp change in slope of the line is observed for $\mathrm{Mg}\to \mathrm{MgO}$ at $\sim 1120^{\circ }\mathrm{C}$
Reason R: Th …

Which one of the following is most likely a mismatch?

Given below are two statements related to Ellingham diagram:
Statement-I : Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals.
Statement-II : It consists of plots of ${\Delta }_{\mathrm{f}}{\mathrm{H}}^0$ vs T for formation of oxides of el …

Which one of the following is not an example of calcination?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.
Reason R: CO tends to get decomposed at higher …

The metal which is extracted by oxidation and subsequent reduction from its ore is :

Which one of the following reactions does not occur during extraction of copper?

Given below are two statements :-

Statement I :- In froth floatation method a rotating paddle agitates the mixture to drive air out of it.

Statement II :- Iron pyrites are generally avoided for extraction of iron due to environmental reasons.

In the light of the above statemen …

The reaction representing the Mond process for metal refining is ____

The major component of which of the following ore is sulphide based mineral?

In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to :

Among following compounds, the number of those present in copper matte is $\_\_\_\_$ .
A. ${\mathrm{CuCO}}_3$
B. ${\mathrm{Cu}}_2\mathrm{S}$
C. ${\mathrm{Cu}}_2\mathrm{O}$
D. FeO

Which one of the following statements is incorrect?

Given below are two statements:

Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement II: During the Hall-Heroult electrolysis process, purified ${\mathrm{Al}}_2{\mathrm{O}}_3$ is mixed wit …

The methods NOT involved in concentration of ore are
(A) Liquation
(B) Leaching
(C) Electrolysis
(D) Hydraulic washing
(E) Froth floatation

Choose the correct answer from the options given below :

In liquation process used for tin $(\mathrm{Sn})$, the metal :

Which of the reaction is suitable for concentrating ore by leaching process?

Which of the following methods are not used to refine any metal?
(A) Liquation
(B) Calcination
(C) Electrolysis
(D) Leaching
(E) Distillation

Choose the correct answer from the options given below:

The compound(s) that is(are) removed as slag during the extraction of copper is :
(1) CaO
(2) FeO
(3) ${\mathrm{Al}}_2{\mathrm{O}}_3$
(4) ZnO
(5) NiO

Choose the correct answer from the options given below :

The metal that is not extracted from its sulphide ore is :

Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if (of) iron is ____.

Given below are two statements.

Statement I: Pig iron is obtained by heating cast iron with scrap iron.
Statement II: Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer from the options given bel …

Refining using liquation method is the most suitable for metals with:

In the metallurgical extraction of copper, following reaction is used :
$\mathrm{FeO}+{\mathrm{SiO}}_2\to {\mathrm{FeSiO}}_3$
FeO and ${\mathrm{FeSiO}}_3$ respectively are.

Statement I: Leaching of gold with cyanide ion in absence of air / ${\mathrm{O}}_2$ leads to cyano complex of $\mathrm{Au}(\mathrm{III})$.

Statement II : Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, cho …

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.
Assertion A: Magnesium can reduce ${\mathrm{Al}}_2{\mathrm{O}}_3$ at a temperature below $1350^{\circ }\mathrm{C}$, while above $1350^{\circ }\mathrm{C}$ aluminium can reduce MgO.
Reason R: T …

The role of depressants in Froth Flotation method is to

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

Given below are two statements :

Statement I : According to the Ellingham diagram, any metal oxide with higher $\Delta {\mathrm{G}}^{\circ }$ is more stable than the one with lower $\Delta {\mathrm{G}}^{\circ }$.
Statement II : The metal involved in the formation of oxide placed l …

Match List-I with List-II

List-I:
(A) Concentration of gold ore
(B) Leaching of alumina
(C) Froth stabiliser
(D) Blister copper

List-II:
(I) Aniline
(II) NaOH
(III) ${\mathrm{SO}}_2$
(IV) NaCN

Choose the correct answer from the options given below.

In metallurgy the term "gangue" is used for:

Which of the following chemical reactions represents Hall-Heroult Process?

(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

Given below are two statements.

Statement I: During electrolytic refining, blister copper deposits precious metals

Statement II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choo …

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :-

Which of the following ore is concentrated using group 1 cyanide salt ?

${\mathrm{Al}}_2{\mathrm{O}}_3$ was leached with alkali to get X . The solution of X on passing of gas Y , forms Z, X, Y and Z respectively are :

Given below are two statements.
Statement I: The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of $\Delta G$ vs temperature.
Statement II: The value of $\Delta G$ increases from left to right in Ellingham diagram.
In the light of t …

Given below are two statements:
Statement I: Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper.
Statement II: It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation metho …

The metal that can be purified economically by fractional distillation method is:

Match List - I with List - II

List - I
(Metal)
(a) Aluminium
(b) Iron
(c) Copper
(d) Zinc

List - II
(Ores)
(i) Siderite
(ii) Calamine
(iii) Kaolinite
(iv) Malachite

Choose the correct answer from the options given below:

Consider two chemical reactions (A) and (B) that take place during metallurgical process:
(a) ${\mathrm{ZnCO}}_{3(\mathrm{s})}\stackrel{\Delta }{\to }{\mathrm{ZnO}}_{(\mathrm{s})}+{\mathrm{CO}}_{2(\mathrm{g})}$
(b) …

Match list I with list II

List I (Name of ore / mineral) | List II (Chemical formula)
(a) Calamine | (i) ZnS
(b) Malachite | (ii) ${\mathrm{FeCO}}_3$
(c) Siderite | (iii) ${\mathrm{ZnCO}}_3$
(d) Sphalerite | (iv) ${\mathrm{CuCO}}_3\cdot \mathrm{Cu}(\mathrm{OH}{)}_2$

Choose the …

Ellingham diagram is a graphical representation of: