${\rm{ZnS}} + {\rm{BaS}}{{\rm{O}}_4}$

On igniting ${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3}$ at 14000$^\circ $C, the product obtained is

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

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

Heating mixture of ${\rm{C}}{{\rm{u}}_2}{\rm{O}}\;{\rm{and}}\;{\rm{C}}{{\rm{u}}_2}{\rm{S}}$ will give

${\rm{Cu}} + {\rm{S}}{{\rm{O}}_2}$

${\rm{C}}{{\rm{u}}_2}{\rm{S}}{{\rm{O}}_3}$

${\rm{Cu}} + {\rm{S}}{{\rm{O}}_3}$

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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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91 Medium

91 of 190

Remembering +4 | -1

The process of extraction of Au and Ag ores is based on their solubility in:

View answer and explanation

Correct option: D

KCN

Option D is correct because the extraction of Au and Ag ores is based on their solubility in KCN (potassium cyanide) solution, which forms soluble cyanide complexes.

92 Easy

92 of 190

Remembering +4 | -1

Anglesite is an ore of:

View answer and explanation

Correct option: D

\mathrm{Pb}

Option D (

\mathrm{Pb}

) is correct because anglesite is a lead sulfate mineral (

\mathrm{PbSO_4}

), making it an ore of lead.

93 Medium

93 of 190

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, using aluminum as a reducing agent, is commonly used to reduce chromium(III) oxide.

94 Easy

94 of 190

Understanding +4 | -1

Statement – I: Ellingham diagram explains the kinetics of reduction process.

Statement – II: Hydraulic washing, a method of concentration of ore is based on the
differences in gravities of the ore and the gangue.

In the light of above statements choose the correct option among the following.

View answer and explanation

Correct option: D

Statement – I is false but statement – II is true

Option D (Statement – I is false but statement – II is true) is correct because Ellingham diagrams relate to thermodynamics, not kinetics, and hydraulic washing separates based on gravity differences.

95 Easy

95 of 190

Remembering +4 | -1

Chinese white is:

View answer and explanation

Correct option: D

ZnO

Option D is correct because Chinese white is the common name for Zinc oxide (ZnO), which is used as a pigment.

96 Medium

96 of 190

Understanding +4 | -1

Presence of small impurity usually makes a metal quite hard because the impurities:

View answer and explanation

Correct option: B

Reduce the number of slide planes

Option B (Reduce the number of slide planes) is correct because impurities disrupt the regular arrangement of atoms, hindering the movement of dislocations and reducing the number of slide planes.

97 Easy

97 of 190

Remembering +4 | -1

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

View answer and explanation

Correct option: C

Option C is correct because carbon is commonly used as a reducing agent in the metallurgical process of iron (Fe) extraction from its oxides.

98 Medium

98 of 190

Remembering +4 | -1

Titanium containing mineral found in our country is

View answer and explanation

Correct option: C

Elmanite

Option C (Elmanite) is correct because Ilmenite is a titanium-containing mineral found in many countries, including India.

99 Medium

99 of 190

Understanding +4 | -1

Purpose of smelting of an ore is

View answer and explanation

Correct option: C

To reduce it

Option C (To reduce it) is correct because smelting involves using a reducing agent to extract the metal from its oxide ore.

100 Easy

100 of 190

Understanding +4 | -1

On igniting

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

at 14000

^\circ

C, the product obtained is

View answer and explanation

Correct option: D

Metallic iron

Option D (Metallic iron) is correct because at very high temperatures, iron oxide decomposes to form metallic iron and oxygen.

101 Medium

101 of 190

Remembering +4 | -1

The impurity of sulphur makes the iron:

View answer and explanation

Correct option: B

Red short

Option B (Red short) is correct because the presence of sulfur as an impurity in iron makes it brittle when hot, a condition known as red shortness.

102 Easy

102 of 190

Remembering +4 | -1

Which is not a basic flux?

View answer and explanation

Correct option: C

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

Option C (SiO2) is correct because silicon dioxide (

SiO_2

) is an acidic flux, while the others are basic fluxes.

103 Easy

103 of 190

Remembering +4 | -1

Which is not an ore of iron?

View answer and explanation

Correct option: C

Cassiterite

Option C is correct because Cassiterite (

SnO_2

) is an ore of tin, not iron.

104 Medium

104 of 190

Understanding +4 | -1

After partial roasting the sulphide ore of copper is reduced by:

View answer and explanation

Correct option: C

Self reduction

Option C (Self reduction) is correct because after partial roasting, the remaining sulphide ore reacts with the formed oxide to reduce itself to the metal.

105 Hard

105 of 190

Application +4 | -1

What is the EAN of

\mathrm{Ag}

in the product obtained after Leaching process?

View answer and explanation

Correct option: A

Option A (50) is correct because the EAN of Ag in the complex

[Ag(CN)_2]^-

is 47 (atomic number) - 1 (charge) + 4 (2 CN ligands * 2 electrons each) = 50.

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106 Easy

106 of 190

Understanding +4 | -1

Melting of Zn metal and then pouring it into cold water gives:

View answer and explanation

Correct option: B

Granulated Zn

Option B (Granulated Zn) is correct because rapidly cooling molten zinc by pouring it into cold water results in the formation of small, irregular granules.

107 Medium

107 of 190

Remembering +4 | -1

Bessemer’s converter is used in the manufacture of:

View answer and explanation

Correct option: C

Steel

Option C (Steel) is correct because the Bessemer converter is a steel-making process that removes impurities from pig iron by oxidation.

108 Easy

108 of 190

Understanding +4 | -1

In zone refining method, the molten zone :

View answer and explanation

Correct option: C

contains more impurity than the original

Option C (contains more impurity than the original) is correct because in zone refining, impurities are more soluble in the molten zone and thus concentrate there as the zone moves.

109 Medium

109 of 190

Understanding +4 | -1

The extraction of nickel involves:

View answer and explanation

Correct option: C

The formation and thermal decomposition of

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

Option C (The formation and thermal decomposition of

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

) is correct because the Mond process involves forming a volatile nickel carbonyl complex and then decomposing it at a higher temperature to obtain pure nickel.

110 Hard

110 of 190

Understanding +4 | -1

For the metallurgical process of which of the following calcined ore can be reduced by carbon?

View answer and explanation

Correct option: A

Haematite

Option A (Haematite) is correct because haematite (Fe2O3) is an iron oxide that can be reduced by carbon in a blast furnace.

111 Medium

111 of 190

Analyzing +4 | -1

Heating mixture of

\mathrm{C}{\mathrm{u}_2}\mathrm{O}\;\mathrm{and}\;\mathrm{C}{\mathrm{u}_2}\mathrm{S}

will give

View answer and explanation

Correct option: D

\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

Option D is correct because when

Cu_2O

and

Cu_2S

are heated together, they react to form copper metal and sulfur dioxide.

112 Medium

112 of 190

Remembering +4 | -1

Which among the following is a carbonate ore ?

View answer and explanation

Correct option: C

Siderite

Option C (Siderite) is correct because Siderite (

FeCO_3

) is a carbonate ore.

113 Medium

113 of 190

Analyzing +4 | -1

Which of the following statements about the advantage of roasting sulphide ore before reduction is true?

a. The

\Delta_{{f}} {G}^{\mathrm{o}}

of the sulphide is greater than that for

{CS}_2

and

{H}_2 {S}

b. The

\Delta {G}

is negative for roasting sulphide ore to oxide.

c. Roasting sulphide to oxide is thermodynamically feasible

d. Carbon and hydrogen are suitable reducing agents for metal sulphides

View answer and explanation

Correct option: B

a, b, and c

Option B (a, b, and c) is correct because all three statements accurately describe the advantages of roasting sulfide ore before reduction.

114 Hard

114 of 190

Analyzing +4 | -1

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

View answer and explanation

Correct option: D

Fe\xrightarrow{{{O_2},\,\,Heat}}F{e_3}{O_4}\xrightarrow{{CO,\,\,600^\circ \,C}}\,FeO\xrightarrow{{CO,\,\,700^\circ \,C}}Fe\,

Option D is correct because it accurately depicts the stepwise reduction of iron oxide (

Fe_3O_4

) to iron (Fe) using CO at different temperatures.

115 Medium

115 of 190

Understanding +4 | -1

Electrolysis of fused carnallite gives:

View answer and explanation

Correct option: D

\mathrm{K},\mathrm{Mg }\;\mathrm{and}\;\mathrm{ C}{\mathrm{l}_2}

Option D (K, Mg and Cl₂) is correct because carnallite (KCl.MgCl₂.6H₂O) upon electrolysis yields potassium, magnesium, and chlorine gas.

116 Medium

116 of 190

Remembering +4 | -1

One of the following metals is obtained by leaching its ore with dilute cyanide solution. Identify it.

View answer and explanation

Correct option: C

Silver

Option C is correct because silver is extracted by leaching its ore with a dilute cyanide solution, forming a soluble silver cyanide complex.

117 Medium

117 of 190

Understanding +4 | -1

Roasting of HgS in air produces:

View answer and explanation

Correct option: D

Option D (Hg) is correct because roasting HgS in air produces mercury and sulfur dioxide.

118 Medium

118 of 190

Analyzing +4 | -1

Which is wrongly matched for refining of metal elements?

View answer and explanation

Correct option: D

\mathrm{Zn}, \mathrm{Cd}

from impurities : Liquation with high boiling points

Option D (

\mathrm{Zn}, \mathrm{Cd}

from impurities : Liquation with high boiling points) is wrongly matched because liquation is suitable for metals with low melting points, not high boiling points.

119 Easy

119 of 190

Understanding +4 | -1

Which is not an organic compound?

View answer and explanation

Correct option: D

Ammonium cyanate

Option D (Ammonium cyanate) is correct because it is an inorganic compound, while the others are organic.

120 Medium

120 of 190

Remembering +4 | -1

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

View answer and explanation

Correct option: C

Bessemer’s converter

Option C (Bessemer’s converter) is correct because it is the equipment used to reduce the carbon content in pig iron to produce steel.

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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