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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 211-240 of 257 questions

211 Medium

211 of 257

Remembering +4 | -1

The most abundant element in the earth crust is:

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Correct option: A

\mathrm{O}

Option A (

\mathrm{O}

) is correct because Oxygen is the most abundant element in the Earth's crust.

212 Medium

212 of 257

Remembering +4 | -1

The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are

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Correct option: B

Washer woman and concentration

Option B (Washer woman and concentration) is correct because the froth floatation method was inspired by a washer woman and is used for ore concentration.

213 Medium

213 of 257

Remembering +4 | -1

F{e_2}{O_3}

is reduced to

FeO

in blast furnace in the temperature range of

View answer and explanation

Correct option: C

500 – 800 K

Option C (500 – 800 K) is correct because in the blast furnace,

F{e_2}{O_3}

is reduced to

FeO

in the temperature range of 500-800 K.

214 Medium

214 of 257

Remembering +4 | -1

Liquation is used to purify:

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Correct option: D

All of these

Option D (All of these) is correct because liquation is a process used to purify metals with low melting points, including Hg, Sn, and Bi.

215 Medium

215 of 257

Remembering +4 | -1

In the electrolytic purification of copper some gold is found in the:

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Correct option: C

Anode mud

Option C (Anode mud) is correct because during electrolytic refining, less reactive metals like gold collect as anode mud.

216 Medium

216 of 257

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Hall-Heroult’s process is given by

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Correct option: C

2A{l_2}{O_3} + 3C \to 4Al + 3C{O_2}

Option C (

2A{l_2}{O_3} + 3C \to 4Al + 3C{O_2}

) is correct because it represents the overall reaction in the Hall-Heroult process.

217 Medium

217 of 257

Remembering +4 | -1

Misch metal is an alloy consisting mainly of

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Correct option: A

Lanthanoid metals

Option A (Lanthanoid metals) is correct because Misch metal is an alloy consisting mainly of lanthanoid metals.

218 Hard

218 of 257

Remembering +4 | -1

Hydrometallurgy is based on

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Correct option: D

Reduction

Option D (Reduction) is correct because hydrometallurgy involves the reduction of metal ions in solution to obtain the pure metal.

219 Medium

219 of 257

Remembering +4 | -1

In electrofining of copper, some gold is deposited as

View answer and explanation

Correct option: D

Anode mud

Option D (Anode mud) is correct because during electrorefining, impurities like gold are deposited as anode mud at the bottom of the electrolytic cell.

220 Medium

220 of 257

Remembering +4 | -1

Slag which is formed during extraction of copper from copper pyrite, is

View answer and explanation

Correct option: B

\mathrm{FeSiO}_3

Option B (

\mathrm{FeSiO}_3

) is correct because during copper extraction from copper pyrite, iron silicate (

\mathrm{FeSiO}_3

) is formed as slag.

221 Medium

221 of 257

Remembering +4 | -1

The purest form of commercial iron is

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Correct option: C

wrought iron

Option C (wrought iron) is correct because wrought iron contains the least amount of carbon, making it the purest form of commercial iron.

222 Medium

222 of 257

Understanding +4 | -1

Statement-1 In leaching of red bauxite

\mathrm{KOH}

\mathrm{HNO}_3

can be used as leaching agents
Statement-2

\mathrm{Al}_2 \mathrm{O}_3

is amphoteric in nature, it can react with both acid & base

View answer and explanation

Correct option: C

Statement-1 is false, statement- 2 is true

The correct answer is C (Statement-1 is false, statement- 2 is true) because KOH can be used, but HNO3 cannot be used as a leaching agent for red bauxite.

223 Medium

223 of 257

Remembering +4 | -1

The main constituent of steel in India are:

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Correct option: D

\mathrm{Mn}\;and\;Cr

Option D (

\mathrm{Mn}\;and\;\mathrm{Cr}

) is correct because Manganese (Mn) and Chromium (Cr) are the main constituents of steel in India.

224 Medium

224 of 257

Remembering +4 | -1

To dissolve argentite ore which of the following is used?

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Correct option: B

NaCN

Option B (NaCN) is correct because NaCN forms a soluble complex with argentite (Ag2S), facilitating its dissolution.

225 Easy

225 of 257

Remembering +4 | -1

Cupellation is used in the metallurgy of

View answer and explanation

Correct option: B

Option B (Ag) is correct because cupellation is a refining process used in the metallurgy of silver (Ag) to remove base metals like lead.

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226 Medium

226 of 257

Remembering +4 | -1

In blast furnace, the highest temperature is in

View answer and explanation

Correct option: C

Combustion zone

Option C (Combustion zone) is correct because the combustion zone in a blast furnace has the highest temperature due to the burning of coke.

227 Medium

227 of 257

Understanding +4 | -1

Electric furnaces are lined with magnesia because:

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Correct option: C

It melts at very high temperature

Option C (It melts at very high temperature) is correct because magnesia (MgO) has a high melting point, making it suitable for lining electric furnaces.

228 Medium

228 of 257

Remembering +4 | -1

Which element is purified by Zone refining?

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Correct option: B

\mathrm{Ge}\;\mathrm{and}\;\mathrm{Si}

Option B (

\mathrm{Ge}\;\mathrm{and}\;\mathrm{Si}

) is correct because both Germanium and Silicon are purified using the zone refining method.

229 Medium

229 of 257

Remembering +4 | -1

In blast furnace, iron oxide is reduced by

View answer and explanation

Correct option: B

Carbon monoxide

Option B (Carbon monoxide) is correct because in the blast furnace, iron oxide is primarily reduced by carbon monoxide, which is formed from the reaction of coke with oxygen.

230 Hard

230 of 257

Remembering +4 | -1

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

View answer and explanation

Correct option: A

Sodium alumino silicate

The correct answer is A (Sodium alumino silicate) because Lapis-Lazuli is a blue-colored gemstone composed of sodium alumino silicate.

231 Easy

231 of 257

Remembering +4 | -1

The most abundant metal in the earth crust is:

View answer and explanation

Correct option: C

\mathrm{Al}

Option C (

\mathrm{Al}

) is correct because Aluminum is the most abundant metal in the Earth's crust.

232 Medium

232 of 257

Understanding +4 | -1

The smelting of iron in a blast furnace involves all the steps except:

View answer and explanation

Correct option: C

Decomposition

Option D (Sublimation) is correct because sublimation is not directly involved in the smelting of iron in a blast furnace.

233 Easy

233 of 257

Remembering +4 | -1

The phenomenon of removing layers of basic oxides from metals before electroplating is called:

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Correct option: C

Pickling

Option C (Pickling) is correct because pickling is the process of removing layers of basic oxides from metals before electroplating.

234 Easy

234 of 257

Remembering +4 | -1

Which of the following is a carbonate ore?

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Correct option: D

Malachite

Option D (Malachite) is correct because Malachite is a copper carbonate hydroxide mineral with the formula

CuCO_3.Cu(OH)_2

235 Medium

235 of 257

Remembering +4 | -1

Bauxite doesn't contain as an impurity

View answer and explanation

Correct option: C

PbO

Option C (

PbO

) is correct because Lead oxide (

PbO

) is not a common impurity found in bauxite ore.

236 Easy

236 of 257

Remembering +4 | -1

The one that is not a carbonate ore is

View answer and explanation

Correct option: D

bauxite

Option D (bauxite) is correct because bauxite is the principal ore of aluminum and is composed primarily of hydrated aluminum oxides, not a carbonate.

237 Medium

237 of 257

Remembering +4 | -1

Which form contains the maximum percentage of carbon?

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Correct option: B

Cast iron

Option C (Morphine) is correct because Morphine is a well-known narcotic analgesic used for pain relief.

238 Medium

238 of 257

Remembering +4 | -1

Which of the following pair is incorrectly matched?

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Correct option: D

Froth Floatation – Cerussite

Option D (Froth Floatation – Cerussite) is correct because Cerussite (PbCO3) is usually concentrated by calcination and not froth floatation.

239 Medium

239 of 257

Remembering +4 | -1

The process of combining metals present in their native ores with mercury to form an alloy is called

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Correct option: C

Amalgamation

Option C (Amalgamation) is correct because amalgamation specifically refers to the process of combining metals with mercury to form an alloy.

240 Easy

240 of 257

Remembering +4 | -1

Sulphide ores are common for the metals

View answer and explanation

Correct option: A

{Ag}, {Cu}

and

{Pb}

Option A is correct. Silver, copper, and lead are commonly found as sulfide ores such as silver glance (

Ag_2S

), copper pyrite (

CuFeS_2

), and galena (

PbS

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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