${\rm{N}}{{\rm{a}}_2}{\rm{Si}}{{\rm{O}}_3}$

${{\rm{K}}_2}{\rm{O}}{\rm{.Si}}{{\rm{O}}_2}{\rm{.A}}{{\rm{l}}_2}{{\rm{O}}_2}$

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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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Showing 181-210 of 257 questions

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181 Easy

181 of 257

Understanding +4 | -1

Which of the given compounds can enhance the efficiency of hydrogen storage tank?

View answer and explanation

Correct option: B

\mathrm{NaNi}_{5}

Option B (

\mathrm{NaNi}_{5}

) is correct because

\mathrm{NaNi}_{5}

is a metal alloy used for hydrogen storage due to its ability to form metal hydrides.

182 Medium

182 of 257

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.

183 Medium

183 of 257

Remembering +4 | -1

Extraction of silver from its ore ore involving

\mathrm{NaCN}

, air and an active metal is known as:

View answer and explanation

Correct option: C

Mc Arthur-Forest method

Option C (Mc Arthur-Forest method) is correct because the Mc Arthur-Forest process is specifically used for the extraction of silver using NaCN and air.

184 Medium

184 of 257

Remembering +4 | -1

Orford process is used in extraction of:

View answer and explanation

Correct option: D

\mathrm{Ni}

Option D (

\mathrm{Ni}

) is correct because the Orford process is specifically used in the extraction of Nickel.

185 Medium

185 of 257

Remembering +4 | -1

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

View answer and explanation

Correct option: D

Copper

Option D (Copper) is correct because cyanide salts are primarily used in the extraction of gold and silver, not commonly for copper.

186 Medium

186 of 257

Remembering +4 | -1

Formula for agate is

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because agate is a variety of quartz, which is silicon dioxide (

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

187 Medium

187 of 257

Understanding +4 | -1

Assertion (A) : Desilverisation of lead is done by Parke's method.

Reason (R) : When lead-silver alloy is poor in silver, zinc is added to molten ore.

View answer and explanation

Correct option: B

Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

Option B is correct because both the assertion and reason are true, but the reason does not explain the assertion.

188 Medium

188 of 257

Remembering +4 | -1

Which of the following metal is thrown as anode mud during electrolytic refining of copper?

View answer and explanation

Correct option: C

\mathrm{Ag}

Option C (

\mathrm{Ag}

) is correct because during the electrolytic refining of copper, less reactive metals like silver accumulate as anode mud.

189 Medium

189 of 257

Remembering +4 | -1

Which element occurs in free state in nature?

View answer and explanation

Correct option: C

\mathrm{Pt}

Option C (

\mathrm{Pt}

) is correct because platinum (Pt) is a noble metal and can occur in the free state in nature due to its inertness.

190 Medium

190 of 257

Analyzing +4 | -1

Mixture of chlorides of copper, cadmium, chromium iron and aluminium was dissolved in water acidified with

{HCl}

and

{H}_2{S}

gas was passed for a sufficient time. It was filtered boiled and a few drops of nitric acid were added while boiling. To this solution ammonium chloride and sodium hydroxide were added and filtered. The filtrate would give test for

View answer and explanation

Correct option: B

sodium and aluminium

Option B (sodium and aluminium) is correct because after precipitation of copper and cadmium sulfides, and removal of iron, aluminium and sodium remain in the filtrate.

191 Easy

191 of 257

Understanding +4 | -1

Metallurgy is the process of:

View answer and explanation

Correct option: C

Extracting the metal from the ore

Option C (Extracting the metal from the ore) is correct because metallurgy encompasses all the processes involved in extracting metals from their ores.

192 Easy

192 of 257

Understanding +4 | -1

Which one is mismatched

View answer and explanation

Correct option: C

Smelting – an oxidation process

Option C (Smelting – an oxidation process) is correct because smelting is a reduction process where metal oxides are reduced to the metallic state, not an oxidation process.

193 Medium

193 of 257

Remembering +4 | -1

The flux used in the smelting of copper is:

View answer and explanation

Correct option: C

Silica

Option C (Silica) is correct because silica is used as a flux to remove iron oxide (FeO) as slag in copper smelting.

194 Medium

194 of 257

Remembering +4 | -1

Which is not an ore of copper?

View answer and explanation

Correct option: A

\mathrm{Cu}\left(\mathrm{NO}_3\right)_2

Option A (

\mathrm{Cu(NO_3)_2}

) is correct because copper nitrate is highly soluble in water, making it unsuitable as a stable ore, whereas the other options are common copper ores.

195 Medium

195 of 257

Understanding +4 | -1

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

View answer and explanation

Correct option: B

Sulphur dioxide

Option A) Copper (I) sulphide is incorrect. Option B (Sulphur dioxide) is correct because in the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with sulphur dioxide.

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196 Medium

196 of 257

Understanding +4 | -1

Extraction of Gold and silver involves leaching the metal with

C{N^ - }

ion. The metal is recovered by

View answer and explanation

Correct option: A

Displacement of metal by some other metal from complex ion

Option C (S-I is correct and S-II is incorrect) is correct because oxides of nitrogen and sulfur cause acid rain, but acid rain does not directly deplete the ozone layer.

197 Medium

197 of 257

Remembering +4 | -1

Silver containing lead as impurity is purified by

View answer and explanation

Correct option: B

Cupellation

Option B (Cupellation) is correct because cupellation is a refining process specifically used to separate noble metals like silver from base metals like lead.

198 Medium

198 of 257

Remembering +4 | -1

Granulated zinc is obtained by:

View answer and explanation

Correct option: B

Adding molten zinc to water

Option B (Adding molten zinc to water) is correct because this process rapidly cools the zinc, causing it to solidify into granules.

199 Medium

199 of 257

Remembering +4 | -1

Which metal is not silver white?

View answer and explanation

Correct option: B

\mathrm{Cu}

Option B (

\mathrm{Cu}

) is correct because Copper (Cu) is reddish-brown, while Nickel (Ni), Sodium (Na), and Tin (Sn) are silver-white.

200 Medium

200 of 257

Remembering +4 | -1

Select the incorrect method regarding the refining of crude metals

View answer and explanation

Correct option: D

Mond process: lead

Option D (Mond process: lead) is correct because the Mond process is used for refining nickel, not lead.

201 Medium

201 of 257

Understanding +4 | -1

During the electrolysis of cryolite, aluminium and fluorine are formed in molar ratio

View answer and explanation

Correct option: B

2:3

Option B (2:3) is correct because the electrolysis of cryolite yields aluminum and fluorine in a 2:3 molar ratio based on the balanced reaction.

202 Easy

202 of 257

Remembering +4 | -1

Difference in density of ore is the basis of :

View answer and explanation

Correct option: C

Gravity separation

Option C (Gravity separation) is correct because gravity separation is a method used to concentrate ores based on differences in the densities of the ore and the gangue (impurities).

203 Medium

203 of 257

Remembering +4 | -1

Which element occurs freely in nature?

View answer and explanation

Correct option: B

Sulphur

Option B (Sulphur) is correct because sulphur can be found in its elemental form in nature, often near volcanic regions.

204 Easy

204 of 257

Remembering +4 | -1

Purification of alumina takes place by

View answer and explanation

Correct option: B

Hall’s process

Option B (Hall’s process) is correct because Hall's process is used for the extraction of aluminium from alumina (

Al_2O_3

205 Medium

205 of 257

Remembering +4 | -1

In the concentration of galena by froth floatation method which of the following is used as a depressant?

View answer and explanation

Correct option: C

\mathrm{NaCN}

Option C (

\mathrm{NaCN}

) is correct because it acts as a depressant in the froth floatation method, selectively preventing ZnS from forming froth while allowing PbS to be collected.

206 Easy

206 of 257

Remembering +4 | -1

The purification method used for mineral

\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3} \cdot 2{\mathrm{H}_2}\mathrm{O}

is:

View answer and explanation

Correct option: B

Leaching

The correct answer is B (Leaching) because leaching is the process used to purify mineral Al₂O₃·2H₂O.

207 Medium

207 of 257

Remembering +4 | -1

Which of the following is a metal?

View answer and explanation

Correct option: C

\mathrm{Bi}

Option C (

\mathrm{Bi}

) is correct because Bismuth (Bi) is a metal, while Phosphorus (P), Arsenic (As), and Antimony (Sb) are non-metals or metalloids.

208 Medium

208 of 257

Remembering +4 | -1

Which is not an iron ore?

View answer and explanation

Correct option: C

Cassiterite

Option C (Cassiterite) is correct because Cassiterite (

\mathrm{Sn}{\mathrm{O}_2}

) is an ore of tin, not iron.

209 Medium

209 of 257

Understanding +4 | -1

During bessemerisation of copper, the reaction taking place in the bessemer convertor is:

View answer and explanation

Correct option: A

\mathrm{C}{\mathrm{u}_2}\mathrm{S} + 2\mathrm{C}{\mathrm{u}_2}\mathrm{O} \to 6\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

Option A (

\mathrm{C}{\mathrm{u}_2}\mathrm{S} + 2\mathrm{C}{\mathrm{u}_2}\mathrm{O} \to 6\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

) is correct because it represents the auto-reduction of copper sulfide during the Bessemer process.

210 Medium

210 of 257

Remembering +4 | -1

The process of removal of gangue particles from ores is known as:

View answer and explanation

Correct option: A

Concentration

Option A (Concentration) is correct because concentration is the process of removing unwanted impurities (gangue) from the 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.

Showing 181-210 of 257 questions

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