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

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:

Find $A,B$ and $C$ in the following reactions:
${\mathrm{NH}}_3+\mathrm{A}+{\mathrm{CO}}_2\to {\left({\mathrm{NH}}_4\right)}_2{\mathrm{CO}}_3$ …

Match list - I with List - II.
List - I (Ore)
(a) Kernite
(b) Cassiterite
(c) Calamine
(d) Cryolite
List - II (Element Present)
(i) Tin
(ii) Boron
(iii) Fluorine
(iv) Zinc
Choose the most appropriate answer from the options given below :

Which refining process is generally used in the purification of low melting metals?

Match List - I with List - II.

Choose the correct answer from the options given below :

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

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 ${\mathrm{Al}}_2{\mathrm{O}}_3$ with cryolite.
Reason (R): The oxidation state o …

The statement that is INCORRECT about Ellingham diagram is:

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

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

Match List - I with List - II:

List - I
(a) Concentration of Ag ore
(b) Blast furnace
(c) Blister copper
(d) Froth floatation method

List - II
(i) Reverberatory furnace
(ii) Pig iron
(iii) Leaching with dilute NaCN solution
(iv) Sulfide ores

Choose the correct answer from the …

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

Calamine and Malachite, respectively, are the ores of:

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

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

Match List - I with List - II:

List - I
(a) Mercury
(b) Copper
(c) Silicon
(d) Nickel

List - II
(i) Vapour phase refining
(ii) Distillation Refining
(iii) Electrolytic Refining
(iv) Zone Refining

Choose the most appropriate answer from the option given below:

Match List - I with List - II

List - I
(a) Haematite
(b) Bauxite
(c) Magnetite
(d) Malachite

List - II
(i) ${\mathrm{Al}}_2{\mathrm{O}}_3\cdot x{\mathrm{H}}_2\mathrm{O}$
(ii) ${\mathrm{Fe}}_2{\mathrm{O}}_3$
(iii) ${\mathrm{CuCO}}_3\cdot \mathrm{Cu}(\mathrm{OH}{)}_2$
(iv) …

The purest form of commercial iron is

The refining method used when the metal and the impurities have low and high melting temperatures, respectively is

Among the reactions (a)-(d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:
(a) $\mathrm{CaO}+{\mathrm{SiO}}_2⟶{\mathrm{CaSiO}}_3$
(b) …

According to the following diagram, A reduces ${\mathrm{BO}}_2$ when the temperature is:

Boron and silicon of very high purity can be obtained through:

The element that can be refined by distillation is:

An Ellingham diagram provides information about:

1. the condition of pH and potential under which a species is thermodynamically stable.
2. the standard Gibbs energies of formation of some metal oxides
3. the kinetics of the reduction process
4. standard electrode potentials of r …

Among statements (a) - (d), the correct ones are:
(a) Lime stone is decomposed to 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 Mond's process.
(d) Zr and Ti are purified by …

The processes of calcination and roasting in metallurgical industries, respectively, can lead to:

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

The Mond process is used for the:

The ore that contains the metal in the form of fluoride is:

Hall-Herolut's process is given by

The reaction that does NOT define calcination is:

The idea of froth floatation method came from a person $X$ and this method is related to the process $Y$ of ores. $X$ and $Y$, respectively, are:

The correct statement is:

Match the ores (column A) with the metals (column B)

In the Hall-heroult process, aluminium is formed at the cathode. The cathode is made out of

The correct statement is:

The pair that does NOT require calcination is :

The one that is not a carbonate is:

Assertion : For the extraction of iron, haematite ore is used

Reason : Haematite is a carbonate ore of iron

The correct statement regarding the given Ellingham diagram is

The ore that contains both iron and copper is

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

Which one of the following ores is best concentrated by froth floatation method?

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

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

Which method of purification is represented by the following equation
$\mathrm{Ti}(\mathrm{s})+2{\mathrm{I}}_2(\mathrm{g})\stackrel{523\mathrm{K}}{\to }{\mathrm{TiI}}_4(\mathrm{g})\stackrel{1700\mathrm{K}}{\to }\mathrm{Ti}(\mathrm{s})+2{\mathrm{I}}_2(\mathrm{g})$

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

During the process of electrolytic refining of copper, some metals present as impurity settle as 'anode mud' These are

Heating mixture of ${\mathrm{Cu}}_2\mathrm{O}$ and ${\mathrm{Cu}}_2\mathrm{S}$ will give

Which one of the following ores is best concentrated by froth - floatation method?