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

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

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

General principles and processes of isolation of elements practice · 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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121 Medium

121 of 175

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.

122 Medium

122 of 175

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.

123 Medium

123 of 175

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.

124 Medium

124 of 175

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}

125 Medium

125 of 175

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.

126 Medium

126 of 175

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.

127 Medium

127 of 175

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.

128 Medium

128 of 175

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.

129 Medium

129 of 175

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.

130 Medium

130 of 175

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.

131 Medium

131 of 175

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.

132 Medium

132 of 175

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.

133 Medium

133 of 175

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.

134 Medium

134 of 175

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.

135 Medium

135 of 175

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.

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136 Medium

136 of 175

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.

137 Medium

137 of 175

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.

138 Medium

138 of 175

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.

139 Medium

139 of 175

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.

140 Medium

140 of 175

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.

141 Medium

141 of 175

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.

142 Medium

142 of 175

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.

143 Medium

143 of 175

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.

144 Medium

144 of 175

Remembering +4 | -1

The most abundant element in the earth crust is:

View answer and explanation

Correct option: A

\mathrm{O}

Option A (

\mathrm{O}

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

145 Medium

145 of 175

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

View answer and explanation

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.

146 Medium

146 of 175

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.

147 Medium

147 of 175

Remembering +4 | -1

Liquation is used to purify:

View answer and explanation

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.

148 Medium

148 of 175

Remembering +4 | -1

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

View answer and explanation

Correct option: C

Anode mud

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

149 Medium

149 of 175

Remembering +4 | -1

Hall-Heroult’s process is given by

View answer and explanation

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.

150 Medium

150 of 175

Remembering +4 | -1

Misch metal is an alloy consisting mainly of

View answer and explanation

Correct option: A

Lanthanoid metals

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

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 175 questions

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