When copper pyrites is roasted in excess if air, a mixture of ${\rm{CuO}} + {\rm{FeO}}$ is formed .${\rm{FeO}}$ is present as impurities. This can be removed as slag during reduction of ${\rm{CuO}}$. The flux added to from slag is

${\rm{Si}}{{\rm{O}}_2}\;\;$ which is an acid flux

Lime stone, which is a basic flux

${\rm{Si}}{{\rm{O}}_2}\;\;$,which is basic flux

Consider two chemical reactions $(A)$ and $(B)$ that take place during metallurgical process: $(A)$ ${\rm{ZnC}}{{\rm{O}}_{\rm{3}}}{\rm{(s)}}\xrightarrow{{\rm{\Delta }}}{\rm{ZnO (s) + C}}{{\rm{o}}_{\rm{2}}}{\rm{(g)}}$ $(B)$ ${\rm{2ZnS (s) + 3}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}}\xrightarrow{{\rm{\Delta }}}{\rm{2ZnO (s) + 2S}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}}$ The correct option of names given to them respectively is

Both $(A)$ and $(B)$ are producing same product so both are roasting

Both $(A)$ and $(B)$ are producing same product so both are calcination

$(A)$ is roasting and $(B)$ is calcination

${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3}$

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

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

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61 Easy

61 of 190

Understanding +4 | -1

When copper pyrites is roasted in excess if air, a mixture of

\mathrm{CuO} + \mathrm{FeO}

is formed .

\mathrm{FeO}

is present as impurities. This can be removed as slag during reduction of

\mathrm{CuO}

. The flux added to from slag is

View answer and explanation

Correct option: A

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

which is an acid flux

Option A (

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

which is an acid flux) is correct because it reacts with the basic

\mathrm{FeO}

impurity to form slag.

62 Easy

62 of 190

Remembering +4 | -1

The grey cast iron contains:

View answer and explanation

Correct option: D

Graphite

Option D (Graphite) is correct because the grey color of grey cast iron is due to the presence of free graphite flakes within the iron matrix.

63 Easy

63 of 190

Remembering +4 | -1

Siderite is an ore of

View answer and explanation

Correct option: D

Option D (Fe) is correct because siderite is a mineral composed of iron(II) carbonate (

FeCO_3

), making it an ore of iron.

64 Medium

64 of 190

Understanding +4 | -1

Which pair of elements can form alloy?

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Correct option: C

Fe and C

Option C (Fe and C) is correct because iron and carbon form steel, which is a well-known alloy.

65 Medium

65 of 190

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 alumina (

\mathrm{Al_2O_3}

) is mixed with cryolite (

\mathrm{Na_3AlF_6}

) to lower its melting point and increase conductivity for efficient electrolysis.

66 Hard

66 of 190

Remembering +4 | -1

Which of the following elements is considered as a metalloid?

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Correct option: D

Te

Option D (

Te

) is correct because tellurium (Te) is generally considered a metalloid due to its intermediate properties between metals and nonmetals.

67 Medium

67 of 190

Remembering +4 | -1

Which metal is used as a reducing agent in smelting?

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Correct option: A

Option A (C) is correct because carbon (in the form of coke or charcoal) is a common reducing agent used in smelting to extract metals from their ores.

68 Easy

68 of 190

Remembering +4 | -1

On the extraction of iron, the slag produced is

View answer and explanation

Correct option: D

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

Option D is correct because during iron extraction, calcium silicate (CaSiO3) is formed as slag, which removes impurities from the molten iron.

69 Easy

69 of 190

Understanding +4 | -1

Consider two chemical reactions

(A)

and

(B)

that take place during metallurgical process:

(A)

\mathrm{ZnC}{\mathrm{O}_\mathrm{3}}\mathrm{(s)}\xrightarrow{\mathrm{\Delta }}\mathrm{ZnO (s) + C}{\mathrm{o}_\mathrm{2}}\mathrm{(g)}

(B)

\mathrm{2ZnS (s) + 3}{\mathrm{O}_\mathrm{2}}\mathrm{(g)}\xrightarrow{\mathrm{\Delta }}\mathrm{2ZnO (s) + 2S}{\mathrm{O}_\mathrm{2}}\mathrm{(g)}

The correct option of names given to them respectively is

View answer and explanation

Correct option: A

(A)

is calcination and

(B)

is roasting

Option A ((A) is calcination and (B) is roasting) is correct because reaction (A) involves heating a carbonate in the absence of air, while reaction (B) involves heating a sulfide in the presence of air.

70 Medium

70 of 190

Understanding +4 | -1

In the electrolysis of alumina, cryolite is added to:

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Correct option: A

Lower the melting point of alumina and to increase the electrical conductivity

Option A (Lower the melting point of alumina and to increase the electrical conductivity) is correct because cryolite acts as a solvent for alumina and improves the conductivity of the electrolytic mixture.

71 Hard

71 of 190

Remembering +4 | -1

‘Lapis-Lazuli’ is a blue coloured precious stone. It is mineral of the class

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Correct option: A

Sodium alumino silicate

Option A (Sodium alumino silicate) is correct because Lapis Lazuli is a metamorphic rock primarily composed of lazurite, a sodium aluminum silicate mineral.

72 Easy

72 of 190

Remembering +4 | -1

The iron obtained from the blast furnace is called:

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Correct option: A

Pig iron

Option A (Pig iron) is correct because the iron obtained directly from a blast furnace is known as pig iron.

73 Hard

73 of 190

Remembering +4 | -1

Match the compound with the metal for which it is used for the process of extraction.

(i)

\mathrm{NaCN}

- (a) Titanium

(ii) Iodine - (b) Aluminium

(iii) Cryolite - (c) Silver ore

View answer and explanation

Correct option: A

(i) - (c), (ii)-(a), (iii)-(b)

Option A ((i) - (c), (ii)-(a), (iii)-(b)) is correct because NaCN is used for silver ore extraction, Iodine for Titanium, and Cryolite for Aluminium.

74 Easy

74 of 190

Understanding +4 | -1

In froth floatation process for the purification of ores, the particles of ore float because

View answer and explanation

Correct option: A

Their surface is not easily wetted by water

Option A (Their surface is not easily wetted by water) is correct because the ore particles are coated with oil, making them hydrophobic and allowing them to float with the froth.

75 Hard

75 of 190

Understanding +4 | -1

Which statement is correct?

View answer and explanation

Correct option: D

Fluxes are carefully choosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities

Option D (Fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities) is correct because fluxes are added to combine with gangue to form slag.

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76 Easy

76 of 190

Understanding +4 | -1

Which of the following reaction is an example of calcination process?

View answer and explanation

Correct option: D

MgC{O_3}MgO + C{O_2}

Option D (

MgC{O_3}MgO + C{O_2}

) is correct because calcination involves heating a carbonate ore to drive off carbon dioxide, resulting in a metal oxide.

77 Medium

77 of 190

Remembering +4 | -1

Which of the following is the chief ore of copper?

View answer and explanation

Correct option: C

\mathrm{CuFe}{\mathrm{S}_2}

Option C (

\mathrm{CuFe}{\mathrm{S}_2}

) is correct because Chalcopyrite is the most abundant and chief ore of copper.

78 Easy

78 of 190

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 for a mineral to be considered an ore, the metal must be extracted from it profitably.

79 Easy

79 of 190

Remembering +4 | -1

Oxford process is used in extraction of:

View answer and explanation

Correct option: D

Option D (Ni) is correct because the Oxford process is specifically used in the extraction of nickel.

80 Easy

80 of 190

Understanding +4 | -1

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out

View answer and explanation

Correct option: C

In the presence of cryolite which forms a melt with lower melting point

Option C is correct because cryolite (Na3AlF6) lowers the melting point of alumina and increases its conductivity, facilitating electrolysis.

81 Medium

81 of 190

Remembering +4 | -1

In the extraction of Zn, the formation of blue flame is due to the burning of:

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Correct option: D

Option D (CO) is correct because the blue flame observed during zinc extraction is due to the combustion of carbon monoxide.

82 Easy

82 of 190

Remembering +4 | -1

Chalcopyrites is an ore of

View answer and explanation

Correct option: B

Copper

Option B (Copper) is correct because chalcopyrite (CuFeS2) is a major ore of copper.

83 Easy

83 of 190

Remembering +4 | -1

Iron is manufactured from the ore

View answer and explanation

Correct option: A

Haematite

Option A (Haematite) is correct because haematite is the primary ore from which iron is manufactured.

84 Medium

84 of 190

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

Option B (A is correct but R is not correct) is correct because the oxidation of carbon to carbon monoxide has a negative slope due to the increase in entropy (

\Delta S

is positive), and CO does not tend to decompose at higher temperatures.

85 Hard

85 of 190

Remembering +4 | -1

Sperrylite is:

View answer and explanation

Correct option: B

\mathrm{PtA}{\mathrm{s}_2}

Option B (

\mathrm{PtA}{\mathrm{s}_2}

) is correct because Sperrylite is a platinum diarsenide mineral with the formula

\mathrm{PtA}{\mathrm{s}_2}

86 Easy

86 of 190

Remembering +4 | -1

Which is not an ore of magnesium?

View answer and explanation

Correct option: C

Gypsum

Option C (Gypsum) is correct because gypsum is calcium sulfate dihydrate (

\mathrm{CaSO_4 \cdot 2H_2O}

), while carnallite, dolomite, and magnesite are magnesium-containing minerals.

87 Easy

87 of 190

Remembering +4 | -1

Which is the chief ore of copper?

View answer and explanation

Correct option: B

Copper pyrites

Option B is correct because Copper pyrites (

CuFeS_2

) is the most abundant and chief ore of copper.

88 Easy

88 of 190

Understanding +4 | -1

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

View answer and explanation

Correct option: C

Copper(I) sulphide

(\mathrm{C}{\mathrm{u}_2}\mathrm{S)}

Option C (Copper(I) sulphide

(\mathrm{C}{\mathrm{u}_2}\mathrm{S)}

) is correct because the final step in copper extraction from sulfide ores involves the reduction of cuprous oxide (

Cu_2O

) by cuprous sulfide (

Cu_2S

89 Easy

89 of 190

Understanding +4 | -1

From gold amalgam, gold may be recovered by:

View answer and explanation

Correct option: C

Distillation

Option C (Distillation) is correct because mercury has a low boiling point and can be easily separated from gold by heating the amalgam.

90 Medium

90 of 190

Analyzing +4 | -1

Which of the following statement(s) is (are) incorrect?

View answer and explanation

Correct option: D

None

Option D (None) is correct because all the given statements about metallurgical processes are accurate.

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