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

General principles and processes of isolation of elements practice · Mixed difficulty

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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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Showing 31-60 of 257 questions

31 Easy

31 of 257

Remembering +4 | -1

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

View answer and explanation

Correct option: A

cryolite

Option A (cryolite) is correct because cryolite (

Na_3AlF_6

) is added to alumina to lower its melting point during the extraction of aluminum.

32 Medium

32 of 257

Remembering +4 | -1

Aluminium is extracted by the electrolysis of:

View answer and explanation

Correct option: D

Alumina mixed with cryolite

Option D (Alumina mixed with cryolite) is correct because cryolite lowers the melting point of alumina and increases its conductivity, making electrolysis feasible.

33 Medium

33 of 257

Remembering +4 | -1

Which of the following is correct?

View answer and explanation

Correct option: C

Wolframeite is

{\mathrm{FeW}{\mathrm{O}_4}}

Option C (Wolframeite is

{\mathrm{FeW}{\mathrm{O}_4}}

) is correct because Wolframite is indeed ferrous tungstate with the chemical formula

{\mathrm{FeW}{\mathrm{O}_4}}

34 Medium

34 of 257

Remembering +4 | -1

Pig iron is converted into steel by decreasing the amount of carbon contained in it, in a:

View answer and explanation

Correct option: C

Bessemer converter

Option C (Bessemer converter) is correct because the Bessemer process uses a Bessemer converter to reduce the carbon content in pig iron to produce steel.

35 Medium

35 of 257

Remembering +4 | -1

The reaction representing the Mond process for metal refining is ____

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Correct option: B

\mathrm{Ni}+4 \mathrm{CO} \stackrel{\Delta}{\longrightarrow} \mathrm{Ni}(\mathrm{CO})_{4}

Option B (

\mathrm{Ni}+4 \mathrm{CO} \stackrel{\Delta}{\longrightarrow} \mathrm{Ni}(\mathrm{CO})_{4}

) is correct because it represents the formation of nickel tetracarbonyl, a key step in the Mond process.

36 Medium

36 of 257

Remembering +4 | -1

Calcination is used in metallurgy for removal of

View answer and explanation

Correct option: B

Water and

{CO}_2

Option B (Water and

{CO}_2

) is correct because calcination involves heating ores to remove volatile substances like water and to decompose carbonates into oxides and carbon dioxide.

37 Medium

37 of 257

Remembering +4 | -1

Thermite is a mixture of

View answer and explanation

Correct option: B

Al powder and

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

Option B (Al powder and

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

) is correct because thermite is a mixture of aluminum powder and iron(III) oxide.

38 Medium

38 of 257

Understanding +4 | -1

Carbon reduction method is generally not applicable for extraction of

View answer and explanation

Correct option: C

Silver

Option C (Silver) is correct because silver is typically extracted using hydrometallurgy (leaching) with cyanide, not carbon reduction.

39 Medium

39 of 257

Remembering +4 | -1

Thermite process is used in reduction of

View answer and explanation

Correct option: A

\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_3}

Option A (

\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_3}

) is correct because the thermite process is specifically used for reducing oxides of less electropositive metals like chromium oxide.

40 Easy

40 of 257

Remembering +4 | -1

Which of the following metal cannot be extracted by smelting process

View answer and explanation

Correct option: D

Aluminium

Option D (Aluminium) is correct because aluminium is extracted by electrolysis, not by smelting.

41 Medium

41 of 257

Analyzing +4 | -1

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.

View answer and explanation

Correct option: B

A is correct but R is not correct

The correct answer is B (A is correct but R is not correct) because while the oxidation of carbon to carbon monoxide does show a negative slope in the Ellingham diagram, CO does not tend to decompose at higher temperatures.

42 Medium

42 of 257

Remembering +4 | -1

Rio Tinto process is used for extraction of:

View answer and explanation

Correct option: A

Option A (Cu) is correct because the Rio Tinto process is specifically designed for the extraction of copper from low-grade ore.

43 Medium

43 of 257

Analyzing +4 | -1

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?

View answer and explanation

Correct option: C

Metal sulphides are less stable than the corresponding oxides

Option C (Metal sulphides are less stable than the corresponding oxides) is the factor of no significance because metal sulfides are generally *more* stable than their corresponding oxides, which is why roasting is necessary.

44 Medium

44 of 257

Remembering +4 | -1

Among the followings, Which ore contains both sulphur and copper?

View answer and explanation

Correct option: D

both (2) and (3)

Option D (both (2) and (3)) is correct because both Chalcoite (

Cu_2S

) and Chalcopyrite (

CuFeS_2

) contain both copper and sulfur.

45 Easy

45 of 257

Remembering +4 | -1

Froth floatation process is based on:

View answer and explanation

Correct option: A

Wetting properties of ore particles

Option A (Wetting properties of ore particles) is correct because the froth flotation process separates minerals based on differences in their wettability by water and oil.

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46 Medium

46 of 257

Remembering +4 | -1

Gold when dissolved in aqua-regia gives:

View answer and explanation

Correct option: C

Chloroauric acid

Option C (Chloroauric acid) is correct because gold dissolves in aqua regia to form chloroauric acid (

\mathrm{HAuCl}_4

47 Easy

47 of 257

Remembering +4 | -1

Hall-Heroult method is used during extraction of:

View answer and explanation

Correct option: A

Aluminium

Option A (Aluminium) is correct because the Hall-Heroult method is used for the extraction of aluminium from alumina.

48 Easy

48 of 257

Remembering +4 | -1

In the Hall’s process for extraction of Al, the ore is fused with:

View answer and explanation

Correct option: B

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}

Option B (

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}

) is correct because in Hall's process, the ore is fused with sodium carbonate to form sodium aluminate.

49 Hard

49 of 257

Remembering +4 | -1

Which is not employed for refining of metal?

View answer and explanation

Correct option: B

Leaching

Option B (Leaching) is correct because leaching is primarily used for extracting metals from ores, not for refining them.

50 Medium

50 of 257

Remembering +4 | -1

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

View answer and explanation

Correct option: D

Sphalerite

Option D is correct because Sphalerite (ZnS) ore is concentrated using group 1 cyanide salts like NaCN as a depressant in the froth flotation method.

51 Medium

51 of 257

Remembering +4 | -1

Froth stabiliser used in froth floatation process is

View answer and explanation

Correct option: C

Cresols

Option C (Cresols) is correct because cresols are used as froth stabilizers in the froth floatation process.

52 Medium

52 of 257

Remembering +4 | -1

CO on passing over heated nickel gives:

View answer and explanation

Correct option: B

\mathrm{Ni}{\left( {\mathrm{CO}} \right)_4}

Option B (

\mathrm{Ni}{\left( {\mathrm{CO}} \right)_4}

) is correct because nickel reacts with carbon monoxide at around 330 K to form nickel carbonyl, which is a volatile compound.

53 Medium

53 of 257

Remembering +4 | -1

Mercury is transported in mental containers made up of:

View answer and explanation

Correct option: A

\mathrm{Fe}

Option A (

\mathrm{Fe}

) is correct because iron does not form an amalgam with mercury, making it suitable for containing and transporting mercury.

54 Medium

54 of 257

Understanding +4 | -1

Which is incorrect as the uses of lime stone in industries are concerned?

View answer and explanation

Correct option: B

In the extraction of Sn from its ore

Option B (In the extraction of Sn from its ore) is correct because limestone is not used in the extraction of Sn from its ore.

55 Medium

55 of 257

Remembering +4 | -1

A metal which is refined by poling is

View answer and explanation

Correct option: C

Blister copper

Option C (Blister copper) is correct because poling is used to refine blister copper by reducing copper oxide impurities.

56 Easy

56 of 257

Remembering +4 | -1

Which substance is used as basic refractory material in furnace?

View answer and explanation

Correct option: C

\mathrm{CaO}

Option C (

\mathrm{CaO}

) is correct because Calcium Oxide (CaO) is a basic oxide and is commonly used as a basic refractory material in furnaces.

57 Easy

57 of 257

Remembering +4 | -1

The temperature of the slag zone in the metallurgy of iron using blast furnace is

View answer and explanation

Correct option: D

800 - 1000^\circ C

Option D (

800 - 1000^\circ C

) is correct because this is the temperature range of the slag zone in a blast furnace used for iron metallurgy.

58 Easy

58 of 257

Remembering +4 | -1

Which one is malachite from the following?

View answer and explanation

Correct option: D

CuC{O_3}.\,Cu{(OH)_2}

Option D (

CuC{O_3}.\,Cu{(OH)_2}

) is correct because malachite is a copper carbonate hydroxide mineral with the formula

CuC{O_3}.\,Cu{(OH)_2}

59 Easy

59 of 257

Remembering +4 | -1

Chromium is obtained by reducing concentrated chromite ore with:

View answer and explanation

Correct option: C

Aluminium powder

Option C (Aluminium powder) is correct because the Goldschmidt process uses aluminum to reduce metal oxides.

60 Medium

60 of 257

Understanding +4 | -1

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:

View answer and explanation

Correct option: C

{\left[ {Au{{(CN)}_2}} \right]^ - }\,\,{\text{and}}\,\,{\left[ {Zn{{(CN)}_4}} \right]^{2 - }}

The correct answer is C (

{\left[ {Au{{(CN)}_2}} \right]^ - }\,\,{\text{and}}\,\,{\left[ {Zn{{(CN)}_4}} \right]^{2 - }}

) because gold leaching forms

[Au(CN)_2]^-

and its reaction with zinc yields

[Zn(CN)_4]^{2-}

Revision notes and key takeaways

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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