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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 151-180 of 257 questions

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151 Easy

151 of 257

Understanding +4 | -1

All ores are minerals, while all minerals are not ores because

View answer and explanation

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 ores are minerals from which metals can be extracted profitably.

152 Medium

152 of 257

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.

153 Medium

153 of 257

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.

154 Easy

154 of 257

Remembering +4 | -1

The pyrolusite ore contains:

View answer and explanation

Correct option: C

Option C (Mn) is correct because pyrolusite is a manganese ore containing

\mathrm{MnO}_2

155 Medium

155 of 257

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.

156 Medium

156 of 257

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.

157 Medium

157 of 257

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.

158 Easy

158 of 257

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 a method used for the extraction of Nickel.

159 Easy

159 of 257

Remembering +4 | -1

Silver containing lead as an impurity is removed by

View answer and explanation

Correct option: B

cupellation

Option B is correct because cupellation is a process used to purify silver containing lead as an impurity by oxidizing the lead.

160 Easy

160 of 257

Remembering +4 | -1

The mineral from which copper is manufactured is:

View answer and explanation

Correct option: D

Chalcopyrite

Option D (Chalcopyrite) is correct because chalcopyrite (CuFeS₂) is a primary ore from which copper is extracted commercially.

161 Easy

161 of 257

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 (Fe) is correct because carbon is commonly used to reduce the oxides of moderately reactive metals like iron.

162 Easy

162 of 257

Remembering +4 | -1

Copper matte consists of

View answer and explanation

Correct option: C

Copper sulphide and ferrous sulphide

Option C (Copper sulphide and ferrous sulphide) is correct because copper matte is a mixture primarily composed of copper(I) sulfide (

\mathrm{Cu}_2\mathrm{S}

) and iron(II) sulfide (FeS).

163 Medium

163 of 257

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.

164 Medium

164 of 257

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.

165 Easy

165 of 257

Remembering +4 | -1

Which of the following ores are concentrated by froth floatation
a) Haematite, b) Galena, c) Copper pyrites, d) Magnetite

View answer and explanation

Correct option: B

b, c

Option B (b, c) is correct because Galena (PbS) and Copper pyrites (CuFeS2) are sulphide ores, which are commonly concentrated using the froth floatation method.

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166 Easy

166 of 257

Understanding +4 | -1

Which of the following reactions is an example for calcination process ?

View answer and explanation

Correct option: D

\mathrm{MgCO}_3 \rightarrow \mathrm{MgO}+\mathrm{CO}_2

Option D (

\mathrm{MgCO}_3 \rightarrow \mathrm{MgO}+\mathrm{CO}_2

) is correct because calcination involves heating a carbonate ore to drive off carbon dioxide.

167 Hard

167 of 257

Understanding +4 | -1

Identify the reaction that does not take place during the smelting process of copper extraction

View answer and explanation

Correct option: B

\mathrm{C}{\mathrm{u}_2}\mathrm{O} + \mathrm{FeS\;} \to \mathrm{C}{\mathrm{u}_2}\mathrm{S} + \mathrm{FeO}

Option B (

\mathrm{C}{\mathrm{u}_2}\mathrm{O} + \mathrm{FeS\;} \to \mathrm{C}{\mathrm{u}_2}\mathrm{S} + \mathrm{FeO}

) is correct because this reaction does not occur during the smelting process of copper extraction.

168 Medium

168 of 257

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.

169 Easy

169 of 257

Understanding +4 | -1

Carbon and

{CO}

gas are used toreduce which of the following pairs of metal oxides for extraction of metals?

View answer and explanation

Correct option: D

{FeO}, {ZnO}

Option D (

{FeO}, {ZnO}

) is correct because carbon and CO gas can reduce both iron oxide and zinc oxide to their respective metals.

170 Medium

170 of 257

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

171 Easy

171 of 257

Remembering +4 | -1

In Dumas method for the estimation of

\mathrm{N}_{2}

, the sample is heated with copper oxide and the gas evolved is passed over

View answer and explanation

Correct option: B

Copper gauze

Option B (Copper gauze) is correct because in the Dumas method, the evolved gases are passed over heated copper gauze to convert any nitrogen oxides back to nitrogen gas.

172 Medium

172 of 257

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.

173 Medium

173 of 257

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.

174 Easy

174 of 257

Remembering +4 | -1

The purest zinc is made by

View answer and explanation

Correct option: B

Zone refining

Option A (Electrolytic refining) is correct because electrolytic refining is a common method for purifying zinc, but zone refining produces the purest form.

175 Medium

175 of 257

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.

176 Easy

176 of 257

Remembering +4 | -1

Barytes, an ore is:

View answer and explanation

Correct option: C

\mathrm{BaS}{\mathrm{O}_4}

Option C (

\mathrm{BaS}{\mathrm{O}_4}

) is correct because Barytes is the mineral name for Barium Sulfate, which has the chemical formula

\mathrm{BaS}{\mathrm{O}_4}

177 Easy

177 of 257

Remembering +4 | -1

The metal which is refined by distillation is

View answer and explanation

Correct option: A

\mathrm{Zn}

Option A (

\mathrm{Zn}

) is correct because zinc has a relatively low boiling point and can be purified by distillation.

178 Medium

178 of 257

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.

179 Medium

179 of 257

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.

180 Medium

180 of 257

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.

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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