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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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Practice format and chapter quiz

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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121 Medium

121 of 257

Analyzing +4 | -1

Assertion (A) Carbonate and hydroxide ores are concentrated by frothfloatation process.

Reason (R) In froth floatation process, mineral oil is used due to itpreferentially wets the gangue particles.

View answer and explanation

Correct option: D

If both Assertion and Reason and false.

Option D (If both Assertion and Reason and false) is correct because Carbonate and hydroxide ores are not concentrated by froth floatation, and mineral oil preferentially wets the ore particles, not gangue.

122 Medium

122 of 257

Remembering +4 | -1

Major impurities present in bauxite are

View answer and explanation

Correct option: A

\mathrm{SiO}_2

, iron oxides and

\mathrm{TiO}_2

The correct answer is A (

\mathrm{SiO}_2

, iron oxides and

\mathrm{TiO}_2

) because bauxite, the principal ore of aluminum, typically contains silica, iron oxides, and titanium dioxide as major impurities.

123 Medium

123 of 257

Understanding +4 | -1

By froth flotation process a mixture of

ZnS

and

PbS

can be separated by adding

NaCN

to form a complex 'X'. The complex is

View answer and explanation

Correct option: C

N{a_2}\left[ {Zn{{\left( {CN} \right)}_4}} \right]

The correct answer is C (

N{a_2}[Zn{(CN)_4}]

) because NaCN selectively reacts with ZnS to form this complex, preventing it from forming froth.

124 Medium

124 of 257

Understanding +4 | -1

Assertion (A): Cast iron is different from pig iron.

Reason (R): Cast iron is made by melting pig iron with scrap iron and coke using hot air blast and has about 3% carbon.

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A (Both (A) and (R) are true and (R) is the correct explanation of (A)) is correct because cast iron is indeed different from pig iron, and the reason provided accurately describes how cast iron is made from pig iron with scrap iron and coke, resulting in a carbon content of about 3%.

125 Medium

125 of 257

Understanding +4 | -1

The main reaction is not occuring in blast furnace during extraction of iron from haematite is

View answer and explanation

Correct option: B

{FeO}+{SiO}_2 \longrightarrow {FeSiO}_3

Option B (

{FeO}+{SiO}_2 \longrightarrow {FeSiO}_3

) is correct because this reaction does not primarily occur in the blast furnace during iron extraction.

126 Easy

126 of 257

Remembering +4 | -1

Iron pyrites ore is concentrated by

View answer and explanation

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.

127 Easy

127 of 257

Remembering +4 | -1

Vapour phase refining of nickel is carried out by using

View answer and explanation

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.

128 Medium

128 of 257

Remembering +4 | -1

The smelting of iron in a blast furnace involves the following processes:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because smelting of iron involves combustion, reduction, and slag formation.

129 Medium

129 of 257

Remembering +4 | -1

Aluminium is refined by

View answer and explanation

Correct option: C

Electrolytic refining

Option C (Electrolytic refining) is correct because aluminum is typically refined using electrolytic refining, specifically the Hall-Héroult process.

130 Medium

130 of 257

Understanding +4 | -1

In the Hoope's process for refining of aluminium, the fused materials form three different layers and they remain separated during electrolysis also. This is because

View answer and explanation

Correct option: B

the three layers have different densities

Option B (the three layers have different densities) is correct because the layers remain separate due to their differing densities, preventing mixing during electrolysis.

131 Medium

131 of 257

Remembering +4 | -1

Which of the following is not ore?

View answer and explanation

Correct option: D

Pig iron

Option D (Pig iron) is correct because pig iron is an impure form of iron, not an ore.

132 Easy

132 of 257

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 :

View answer and explanation

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.

133 Medium

133 of 257

Remembering +4 | -1

By which process Pb and Sn are extracted respectively?

View answer and explanation

Correct option: B

Self reduction—carbon reduction

Option B (Self reduction—carbon reduction) is correct because lead is extracted by self-reduction and tin is extracted by carbon reduction.

134 Medium

134 of 257

Understanding +4 | -1

Which process represents the change,

\mathrm{Ti} + 2{\mathrm{I}_2} \to \mathrm{Ti}{\mathrm{I}_4} \to \mathrm{Ti} + 2{\mathrm{I}_2}

View answer and explanation

Correct option: B

Van Arkel

Option B (Van Arkel) is correct because the Van Arkel method is used for the purification of metals like Titanium, involving the formation and decomposition of a volatile metal iodide.

135 Medium

135 of 257

Remembering +4 | -1

An ore of tin containing

\mathrm{FeCr}{\mathrm{O}_4}

is concentrated by

View answer and explanation

Correct option: C

Magnetic separation

Option C (Magnetic separation) is correct because

\mathrm{FeCr}{\mathrm{O}_4}

is magnetic and can be separated from the non-magnetic tin ore using magnetic separation.

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136 Medium

136 of 257

Remembering +4 | -1

Which of the following is the heaviest metal?

View answer and explanation

Correct option: A

\mathrm{U}

Option A (

\mathrm{U}

) is correct because Uranium has the highest mass number among the given options, making it the heaviest.

137 Medium

137 of 257

Remembering +4 | -1

Complexes formed in the following methods are
I. Mond’s process for purification of nickel.
II. Removal of lead poisoning from the body.
III. Cyanide process for extraction of silver.
IV. Froth flotation process for separation of

ZnS

from galena ore by using depressant.

View answer and explanation

Correct option: B

\begin{array}{cccccccccccccccccccc} I&{II}&{III}&{IV}\\ {Ni{{(CO)}_4}}&{{{\left[ {Pb(EDTA)} \right]}^{2 - }}}&{{{\left[ {Ag{{(CN)}_2}} \right]}^ - }}&{{{\left[ {Zn{{(CN)}_4}} \right]}^{2 - }}} \end{array}

Option B is correct because it correctly identifies the complexes formed in each of the mentioned processes.

138 Easy

138 of 257

Remembering +4 | -1

The chief impurity present in red bauxite is

View answer and explanation

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}

139 Medium

139 of 257

Remembering +4 | -1

Which metal is purified by Pattinson’s process?

View answer and explanation

Correct option: A

The correct answer is A (Ag) because Pattinson's process is specifically used for the purification of silver.

140 Easy

140 of 257

Remembering +4 | -1

An example of an oxide is

View answer and explanation

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.

141 Medium

141 of 257

Remembering +4 | -1

Bredig's arc method can be used to prepare colloidal solution of

View answer and explanation

Correct option: B

\mathrm{Pt}

Option B (Pt) is correct because Bredig's arc method is specifically used for preparing colloidal solutions of metals like platinum.

142 Medium

142 of 257

Understanding +4 | -1

Which mixed sulphate is not an alum?

View answer and explanation

Correct option: D

\mathrm{CuS}{\mathrm{O}_4} \cdot \mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3} \cdot 24{\mathrm{H}_2}\mathrm{O}

Option D (

\mathrm{CuS}{\mathrm{O}_4} \cdot \mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3} \cdot 24{\mathrm{H}_2}\mathrm{O}

) is correct because copper has a +2 charge, while alums require a monovalent cation and a trivalent cation.

143 Medium

143 of 257

Remembering +4 | -1

The method used for the purification of indium is

View answer and explanation

Correct option: C

zone refining

Option C (zone refining) is correct because zone refining is a method used to purify metals like indium to a very high degree.

144 Medium

144 of 257

Remembering +4 | -1

The most malleable metal is:

View answer and explanation

Correct option: C

Gold

Option C (Gold) is correct because gold is known for its high malleability, meaning it can be easily hammered into thin sheets.

145 Medium

145 of 257

Remembering +4 | -1

Tin is extracted from tin stone by heating it in a furnace with:

View answer and explanation

Correct option: D

Coal

Option D (Coal) is correct because tin is extracted from tin stone (

SnO_2

) by reduction with carbon (coal) in a furnace.

146 Easy

146 of 257

Remembering +4 | -1

Blister copper is obtained by:

View answer and explanation

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.

147 Medium

147 of 257

Remembering +4 | -1

The reduction of metal oxides is sometimes done by aluminium in the

View answer and explanation

Correct option: C

Goldschmidt reaction

Option C (Goldschmidt reaction) is correct because the Goldschmidt reaction (thermite process) uses aluminum to reduce metal oxides to their respective metals.

148 Medium

148 of 257

Remembering +4 | -1

Near the top of a blast furnace employed for the extraction of iron the metal oxides are reduced to spongy iron by:

View answer and explanation

Correct option: B

Option B (CO) is correct because carbon monoxide (CO) is the primary reducing agent in the upper part of a blast furnace, converting metal oxides to spongy iron.

149 Medium

149 of 257

Remembering +4 | -1

Hoope’s process is used in the refining of:

View answer and explanation

Correct option: A

Option A (Al) is correct because Hoope's process is an electrolytic refining method specifically used for aluminum.

150 Medium

150 of 257

Understanding +4 | -1

Roasting is used for to convert into its respective oxide.

View answer and explanation

Correct option: C

\mathrm{Cu}_2 \mathrm{~S}

Option C (

\mathrm{Cu}_2 \mathrm{~S}

) is correct because roasting is a metallurgical process primarily used to convert sulfide ores into their respective oxides.

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.

Showing 121-150 of 257 questions

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