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JEE • CHEMISTRY • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

General principles and processes of isolation of elements practice · Easy

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These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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31 Easy

31 of 72

Remembering +4 | -1

Which one of the following metals, is extracted on smelting of its ore in blast furnace?

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Correct option: A

Iron

Option A (Iron) is correct because iron is extracted by smelting its ore in a blast furnace.

32 Easy

32 of 72

Remembering +4 | -1

Which is not a basic flux

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Correct option: A

Silica

Option A (Silica) is correct because silica is an acidic flux, while the others are basic fluxes.

33 Easy

33 of 72

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On the extraction of iron, the slag produced is

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Correct option: D

\mathrm{CaSi}{\mathrm{O}_3}

Option D (

\mathrm{CaSi}{\mathrm{O}_3}

) is correct because it is the product of the reaction between CaO (from limestone decomposition) and silica (

\mathrm{Si}{\mathrm{O}_2}

) impurity during iron extraction.

34 Easy

34 of 72

Remembering +4 | -1

Ore pitch blende is main source of

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Correct option: A

Option A is correct because pitchblende is a uranium-rich ore, and radium (Ra) is a decay product of uranium.

35 Easy

35 of 72

Remembering +4 | -1

Iron pyrites ore is concentrated by

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Correct option: A

Froth floatation

Option A is correct because froth floatation is a technique used to concentrate sulfide ores like iron pyrites (FeS2) by selectively separating them from gangue based on their hydrophobicity.

36 Easy

36 of 72

Remembering +4 | -1

Vapour phase refining of nickel is carried out by using

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Correct option: D

\mathrm{CO}

Option D (

\mathrm{CO}

) is correct because carbon monoxide is used in the Mond's process for vapor phase refining of nickel.

37 Easy

37 of 72

Understanding +4 | -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 :

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Correct option: D

Both Statement I and Statement II are correct

Option D (Both Statement I and Statement II are correct) is correct because sulfide ores are generally converted to oxides for easier reduction.

38 Easy

38 of 72

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The chief impurity present in red bauxite is

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Correct option: B

\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}

Option B (

\mathrm{Fe_2O_3}

) is correct because the chief impurity present in red bauxite is iron oxide (

\mathrm{Fe_2O_3}

39 Easy

39 of 72

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An example of an oxide is

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Correct option: B

Bauxite

Option B (Bauxite) is correct because bauxite is an ore of aluminum and its chemical formula is

Al_2O_3.2H_2O

, which is an oxide.

40 Easy

40 of 72

Remembering +4 | -1

Blister copper is obtained by:

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Correct option: A

Bessemerisation

Option A (Bessemerisation) is correct because blister copper is produced during the Bessemerisation process, where impurities are removed from molten copper sulfide.

41 Easy

41 of 72

Understanding +4 | -1

All ores are minerals, while all minerals are not ores because

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Correct option: C

The metal cannot be extracted economically from all the minerals

Option C (The metal cannot be extracted economically from all the minerals) is correct because ores are minerals from which metals can be extracted profitably.

42 Easy

42 of 72

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The pyrolusite ore contains:

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Correct option: C

Option C (Mn) is correct because pyrolusite is a manganese ore containing

\mathrm{MnO}_2

43 Easy

43 of 72

Remembering +4 | -1

Oxford process is used in extraction of:

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Correct option: D

Option D (Ni) is correct because the Oxford process is a method used for the extraction of Nickel.

44 Easy

44 of 72

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Silver containing lead as an impurity is removed by

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Correct option: B

cupellation

Option B is correct because cupellation is a process used to purify silver containing lead as an impurity by oxidizing the lead.

45 Easy

45 of 72

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The mineral from which copper is manufactured is:

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Correct option: D

Chalcopyrite

Option D (Chalcopyrite) is correct because chalcopyrite (CuFeS₂) is a primary ore from which copper is extracted commercially.

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46 Easy

46 of 72

Remembering +4 | -1

In which metal’s metallurgical process carbon is used for reduction of metal oxides?

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Correct option: C

Option C (Fe) is correct because carbon is commonly used to reduce the oxides of moderately reactive metals like iron.

47 Easy

47 of 72

Remembering +4 | -1

Copper matte consists of

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Correct option: C

Copper sulphide and ferrous sulphide

Option C (Copper sulphide and ferrous sulphide) is correct because copper matte is a mixture primarily composed of copper(I) sulfide (

\mathrm{Cu}_2\mathrm{S}

) and iron(II) sulfide (FeS).

48 Easy

48 of 72

Remembering +4 | -1

Which of the following ores are concentrated by froth floatation
a) Haematite, b) Galena, c) Copper pyrites, d) Magnetite

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Correct option: B

b, c

Option B (b, c) is correct because Galena (PbS) and Copper pyrites (CuFeS2) are sulphide ores, which are commonly concentrated using the froth floatation method.

49 Easy

49 of 72

Understanding +4 | -1

Which of the following reactions is an example for calcination process ?

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Correct option: D

\mathrm{MgCO}_3 \rightarrow \mathrm{MgO}+\mathrm{CO}_2

Option D (

\mathrm{MgCO}_3 \rightarrow \mathrm{MgO}+\mathrm{CO}_2

) is correct because calcination involves heating a carbonate ore to drive off carbon dioxide.

50 Easy

50 of 72

Understanding +4 | -1

Carbon and

{CO}

gas are used toreduce which of the following pairs of metal oxides for extraction of metals?

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Correct option: D

{FeO}, {ZnO}

Option D (

{FeO}, {ZnO}

) is correct because carbon and CO gas can reduce both iron oxide and zinc oxide to their respective metals.

51 Easy

51 of 72

Remembering +4 | -1

In Dumas method for the estimation of

\mathrm{N}_{2}

, the sample is heated with copper oxide and the gas evolved is passed over

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Correct option: B

Copper gauze

Option B (Copper gauze) is correct because in the Dumas method, the evolved gases are passed over heated copper gauze to convert any nitrogen oxides back to nitrogen gas.

52 Easy

52 of 72

Remembering +4 | -1

The purest zinc is made by

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Correct option: B

Zone refining

Option A (Electrolytic refining) is correct because electrolytic refining is a common method for purifying zinc, but zone refining produces the purest form.

53 Easy

53 of 72

Remembering +4 | -1

Barytes, an ore is:

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Correct option: C

\mathrm{BaS}{\mathrm{O}_4}

Option C (

\mathrm{BaS}{\mathrm{O}_4}

) is correct because Barytes is the mineral name for Barium Sulfate, which has the chemical formula

\mathrm{BaS}{\mathrm{O}_4}

54 Easy

54 of 72

Remembering +4 | -1

The metal which is refined by distillation is

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Correct option: A

\mathrm{Zn}

Option A (

\mathrm{Zn}

) is correct because zinc has a relatively low boiling point and can be purified by distillation.

55 Easy

55 of 72

Understanding +4 | -1

Which of the given compounds can enhance the efficiency of hydrogen storage tank?

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Correct option: B

\mathrm{NaNi}_{5}

Option B (

\mathrm{NaNi}_{5}

) is correct because

\mathrm{NaNi}_{5}

is a metal alloy used for hydrogen storage due to its ability to form metal hydrides.

56 Easy

56 of 72

Understanding +4 | -1

Metallurgy is the process of:

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Correct option: C

Extracting the metal from the ore

Option C (Extracting the metal from the ore) is correct because metallurgy encompasses all the processes involved in extracting metals from their ores.

57 Easy

57 of 72

Understanding +4 | -1

Which one is mismatched

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Correct option: C

Smelting – an oxidation process

Option C (Smelting – an oxidation process) is correct because smelting is a reduction process where metal oxides are reduced to the metallic state, not an oxidation process.

58 Easy

58 of 72

Remembering +4 | -1

Difference in density of ore is the basis of :

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Correct option: C

Gravity separation

Option C (Gravity separation) is correct because gravity separation is a method used to concentrate ores based on differences in the densities of the ore and the gangue (impurities).

59 Easy

59 of 72

Remembering +4 | -1

Purification of alumina takes place by

View answer and explanation

Correct option: B

Hall’s process

Option B (Hall’s process) is correct because Hall's process is used for the extraction of aluminium from alumina (

Al_2O_3

60 Easy

60 of 72

Remembering +4 | -1

The purification method used for mineral

\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3} \cdot 2{\mathrm{H}_2}\mathrm{O}

is:

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Correct option: B

Leaching

The correct answer is B (Leaching) because leaching is the process used to purify mineral Al₂O₃·2H₂O.

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Review GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS in your textbook or class notes, then use this set to check your understanding.

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