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

General principles and processes of isolation of elements practice · Medium

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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 91-120 of 175 questions

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91 Medium

91 of 175

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.

92 Medium

92 of 175

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.

93 Medium

93 of 175

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.

94 Medium

94 of 175

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.

95 Medium

95 of 175

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.

96 Medium

96 of 175

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.

97 Medium

97 of 175

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.

98 Medium

98 of 175

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.

99 Medium

99 of 175

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.

100 Medium

100 of 175

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.

101 Medium

101 of 175

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.

102 Medium

102 of 175

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.

103 Medium

103 of 175

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.

104 Medium

104 of 175

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.

105 Medium

105 of 175

Remembering +4 | -1

For the electrolytic refining of aluminium, the three fused layers consist of

View answer and explanation

Correct option: C

Bottom layer - Anode of impure

Al

, Middle layer - Cryolite and barium fluoride, Upper layer - Cathode of pure

Al

The correct answer is C (Bottom layer - Anode of impure

Al

, Middle layer - Cryolite and barium fluoride, Upper layer - Cathode of pure

Al

) because this accurately describes the electrolytic refining process of aluminum.

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106 Medium

106 of 175

Remembering +4 | -1

Gallium arsenide is purified by

View answer and explanation

Correct option: B

Zone-refining method

Option B (Zone-refining method) is correct because zone refining is a technique used to purify semiconductors like gallium arsenide.

107 Medium

107 of 175

Understanding +4 | -1

Assertion (A) :

{Al}_2 {O}_3

is converted into

{Al}

by reduction with carbon.

Reason (R) : Carbon (graphite) has greater affinity for oxygen than aluminium has.

View answer and explanation

Correct option: D

\mathbf{A}

and

\mathbf{R}

both are false.

Option D (

\mathbf{A}

and

\mathbf{R}

both are false.) is correct because aluminum oxide is not reduced by carbon, and carbon does not have a greater affinity for oxygen than aluminum.

108 Medium

108 of 175

Understanding +4 | -1

In the extraction of silver from argentite ore. The ore is treated with dil. solution of

\mathrm{NaCN}

in water in the presence of

\mathrm{Y}

, whereby the following reaction takes place:

\mathrm{Ag}_2 \mathrm{X}+4 \mathrm{NaCN}+2 \mathrm{Y} \rightarrow 2 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_2\right]+\mathrm{Na}_2 \mathrm{XO}_4 \cdot \mathrm{X}

and

\mathrm{Y}

in this reaction are respectively :

View answer and explanation

Correct option: B

\mathrm{S}

and

\mathrm{O}_2

Option B (

\mathrm{S}

and

\mathrm{O}_2

) is correct because the reaction involves silver sulfide reacting with sodium cyanide and oxygen to form a silver cyanide complex and sodium sulfate.

109 Medium

109 of 175

Remembering +4 | -1

Which metal is used as a reducing agent in smelting?

View answer and explanation

Correct option: A

The correct answer is A (C) because carbon (in the form of coke or charcoal) is commonly used as a reducing agent in smelting processes to extract metals from their ores.

110 Medium

110 of 175

Analyzing +4 | -1

Assertion (A): At 673 K,

{CO}

is better reducing agent for

{Fe}_2 {O}_3

than coke.

Reason (R):

\Delta G_{\left({CO}, {CO}_2\right)}

is less than

\Delta G_{({C}, {CO})}

at 673 K.

View answer and explanation

Correct option: A

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

Option A is correct because both the assertion and the reason are true, and the reason correctly explains the assertion based on thermodynamics.

111 Medium

111 of 175

Understanding +4 | -1

The metal which is extracted by oxidation and
subsequent reduction from its ore is

View answer and explanation

Correct option: D

\text{Ag}

Option D (Ag) is correct because silver is extracted using the cyanide process, which involves oxidation followed by reduction.

112 Medium

112 of 175

Remembering +4 | -1

The metal used in storage batteries is:

View answer and explanation

Correct option: C

\mathrm{Pb}

Option C (Pb) is correct because lead (Pb) is the primary metal used in lead-acid storage batteries due to its electrochemical properties.

113 Medium

113 of 175

Remembering +4 | -1

Which of the following is chalcopyrite?

View answer and explanation

Correct option: A

{CuFeS}_2

Option A (

{CuFeS}_2

) is correct because chalcopyrite is a copper iron sulfide mineral with the formula

{CuFeS}_2

114 Medium

114 of 175

Remembering +4 | -1

Which of the following pairs of metals is purified by van Arkel method?

View answer and explanation

Correct option: C

\mathrm{Zr}\;and\;\mathrm{Ti}

Option C (Zr and Ti) is correct because the Van Arkel method is specifically used for purifying these metals by forming volatile iodides.

115 Medium

115 of 175

Remembering +4 | -1

Smelting is done in:

View answer and explanation

Correct option: A

Blast furnace

Option A (Blast furnace) is correct because smelting, the process of extracting metal from its ore by heating, is commonly carried out in a blast furnace.

116 Medium

116 of 175

Analyzing +4 | -1

Which of the following becomes paramagnetic on heating at

850 \mathrm{~K}

View answer and explanation

Correct option: D

(2) & (3) both

The correct answer is D because both Fe3O4 and ZnFe2O4, which are ferrimagnetic, become paramagnetic when heated to 850 K due to the randomization of spin alignment.

117 Medium

117 of 175

Remembering +4 | -1

Cupellation process is used in the metallurgy of:

View answer and explanation

Correct option: B

Silver

Option B (Silver) is correct because the cupellation process is specifically used to refine silver from lead-silver alloys.

118 Medium

118 of 175

Remembering +4 | -1

The maximum temperature that can be achieved in blast furnace is:

View answer and explanation

Correct option: D

Upto 2200 K

Option D (Upto 2200 K) is correct because this is the maximum temperature achievable in a blast furnace.

119 Medium

119 of 175

Remembering +4 | -1

Zinc is obtained from

View answer and explanation

Correct option: C

Calamine

Option C (Calamine) is correct because calamine (

\mathrm{ZnCO}_3

) is a zinc ore from which zinc can be extracted.

120 Medium

120 of 175

Remembering +4 | -1

In metallurgy the term "gangue" is used for:

View answer and explanation

Correct option: A

Contamination of undesired earthy materials.

Option A (Contamination of undesired earthy materials) is correct because gangue refers to the unwanted rocky or earthy materials present in an ore.

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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