General Principles and Processes of Isolation of Elements

The chemical composition of ’slag’ formed during the smelting process in the extraction of copper is:

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

The chemical composition of ’slag’ formed during the smelting process in the extraction of copper is:

The ore that contains both iron and copper is

The major components of German Silver are:

[JEE Main 2021, 25 Feb (Shift 2)]

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

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
\[Mg \rightarrow MgO \text { at } \sim 1120^{\circ} C\]

Reason (R): There is a large change of entropy associated with the change of state

In the light of the above statements, choose the correct answer from the options given below:

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

[JEE Main 2023, 15 Apr (Shift 1)]

Which one of the following is most likely a mismatch?

[JEE Main 2023, 13 Apr (Shift 1)]

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

[JEE Main 2021, 18 Mar (Shift 1)]

Consider two chemical reactions \( (\mathrm{A}) \) and (B) that take place during metallurgical process

(A) \( \mathrm{ZnCO}_{3} \) (s) \( \rightarrow \mathrm{ZnO}+\mathrm{CO}_{2} \)

(B) \( 2 \mathrm{~ZnS}+3 \mathrm{~O}_{2} \rightarrow 2 \mathrm{~ZnO}+2 \mathrm{~SO}_{2} \)

The correct option of names given to them respectively is

[JEE Main 2021, 20 Jul (Shift 2)]

Ellingham diagram is a graphical representation of:

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 \(\Delta_{ f} H ^0\) vs T for formation of oxides of elements.

In the light of the above statements, choose the most appropriate answer from the options given below:

[JEE Main 2023, 13 Apr (Shift 2)]

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

[JEE Main 2023, 30 Jan (Shift 1)]

Which of the following reduction reaction CANNOT be carried out with coke?

[JEE Main 2021, 16 Mar (Shift 2)]

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

[JEE Main 2021, 20 Jul (Shift 1)]

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

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

[JEE Main 2023, 10 Apr (Shift 1)]

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 given below

[JEE Main 2023, 11 Apr (Shift 2)]

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with \(NaOH\) is:

[JEE Main 2021, 25 Jul (Shift 1)]

The statement that is INCORRECT about Ellingham diagram is:

[JEE Main 2021, 27 Jul (Shift 1)]

The method used for the purification of Indium is:

[JEE Main 2021, 25 Feb (Shift 2)]

In the extraction process of copper, the product obtained after carrying out the reactions
(i) \(2 Cu _2 S +3 O _2 \rightarrow 2 Cu _2 O +2 SO _2\)
(ii) \(2 Cu _2 O + Cu _2 S \rightarrow 6 Cu + SO _2\) is called

[JEE Main 2023, 11 Apr (Shift 1)]

Sulphide ion is soft base and its ores are common for metals.
(A) \(Pb\)
(B) \(Al\)
(C) \(Ag\)
(D) \(Mg\)

Choose the correct answer from the options given below:

[JEE Main 2021, 22 Jul (Shift 2)]

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. \(\mathrm{FeO}\)

[JEE Main 2023, 1 Feb (Shift 2)]

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

[JEE Main 2021, 24 Feb (Shift 1)]

The standard electrode potential \(\left({\mathrm{M}}^{3+}/{\mathrm{M}}^{2+}\right)\) for V, Cr, Mn&Co are \(-0.26\mathrm{V},-0.41\mathrm{V},+1.57\mathrm{V}\) and \(+1.97\mathrm{V}\), respectively. The metal ions which can liberate \({\mathrm{H}}_{2}\) from a dilute acid are

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 method.

Choose the most appropriate answer from the options given below:

[JEE Main 2021, 26 Aug (Shift 2)]

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 .

[JEE Main 2021, 31 Aug (Shift 1)]

Among statements (a) - (d), the correct ones are

(a) Lime stone is decomposed to \( \mathrm{CaO} \) during the extraction of iron from its oxides.

(b) In the extraction of silver, silver is extracted as an anionic complex.

(c) Nickel is purified by Monds process.

(d) \( \mathrm{Zr} \) and \( \mathrm{Ti} \) are purified by Van Arkel method.

Which one of the following statements is incorrect?

[JEE Main 2023, 31 Jan (Shift 2)]

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 statements, choose the correct answer from the options given below:

[JEE Main 2023, 25 Jan (Shift 2)]

The major components in Gun Metal are:

[JEE Main 2021, 24 Feb (Shift 1)]

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 \(Al _2 O _3\) is mixed with \(Na _3 AlF _6\) to lower the melting point of the mixture. In the light of the above statements, choose the most appropriate answer from the options given below:

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 temperature.

In the light of the above statements, choose the correct answer from the options given below

[JEE Main 2023, 1 Feb (Shift 1)]

The addition of silica during the extraction of copper from its sulphide ore

[JEE Main 2021, 27 Jul (Shift 2)]

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:

[JEE Main 2023, 31 Jan (Shift 1)]

The major components of German Silver are:

The process that involves the removal of sulphur from the ores is:

[JEE Main 2021, 16 Mar (Shift 1)]

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 \(Pt\)

[JEE Main 2021, 31 Aug (Shift 2)]

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

[JEE Main 2023, 25 Jan (Shift 1)]

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

[JEE Main 2023, 24 Jan (Shift 2)]

Match list-I with list-II:

Choose the most appropriate answer from the option given below:

[JEE Main 2021, 18 Mar (Shift 2)]

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

[JEE Main 2023, 29 Jan (Shift 2)]

Calamine and Malachite, respectively, are the ores of:

[JEE Main 2021, 1 Sep (Shift 2)]