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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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Showing 151-175 of 175 questions

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151 Medium
151 of 175
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.
152 Medium
152 of 175
Remembering +4 | -1
Slag which is formed during extraction of copper from copper pyrite, is
View answer and explanation
Correct option: B
FeSiO3\mathrm{FeSiO}_3
Option B (FeSiO3\mathrm{FeSiO}_3) is correct because during copper extraction from copper pyrite, iron silicate (FeSiO3\mathrm{FeSiO}_3) is formed as slag.
153 Medium
153 of 175
Remembering +4 | -1
The purest form of commercial iron is
View answer and explanation
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.
154 Medium
154 of 175
Understanding +4 | -1
Statement-1 In leaching of red bauxite KOH\mathrm{KOH} or HNO3\mathrm{HNO}_3 can be used as leaching agents
Statement-2 Al2O3\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.
155 Medium
155 of 175
Remembering +4 | -1
The main constituent of steel in India are:
View answer and explanation
Correct option: D
Mn  and  Cr\mathrm{Mn}\;and\;Cr
Option D (Mn  and  Cr\mathrm{Mn}\;and\;\mathrm{Cr}) is correct because Manganese (Mn) and Chromium (Cr) are the main constituents of steel in India.
156 Medium
156 of 175
Remembering +4 | -1
To dissolve argentite ore which of the following is used?
View answer and explanation
Correct option: B
NaCN
Option B (NaCN) is correct because NaCN forms a soluble complex with argentite (Ag2S), facilitating its dissolution.
157 Medium
157 of 175
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.
158 Medium
158 of 175
Understanding +4 | -1
Electric furnaces are lined with magnesia because:
View answer and explanation
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.
159 Medium
159 of 175
Remembering +4 | -1
Which element is purified by Zone refining?
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Correct option: B
Ge  and  Si\mathrm{Ge}\;\mathrm{and}\;\mathrm{Si}
Option B (Ge  and  Si\mathrm{Ge}\;\mathrm{and}\;\mathrm{Si}) is correct because both Germanium and Silicon are purified using the zone refining method.
160 Medium
160 of 175
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.
161 Medium
161 of 175
Understanding +4 | -1
The smelting of iron in a blast furnace involves all the steps except:
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Correct option: C
Decomposition
Option D (Sublimation) is correct because sublimation is not directly involved in the smelting of iron in a blast furnace.
162 Medium
162 of 175
Remembering +4 | -1
Bauxite doesn't contain as an impurity
View answer and explanation
Correct option: C
PbOPbO
Option C (PbOPbO) is correct because Lead oxide (PbOPbO) is not a common impurity found in bauxite ore.
163 Medium
163 of 175
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.
164 Medium
164 of 175
Remembering +4 | -1
Which of the following pair is incorrectly matched?
View answer and explanation
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.
165 Medium
165 of 175
Remembering +4 | -1
The process of combining metals present in their native ores with mercury to form an alloy is called
View answer and explanation
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.

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166 Medium
166 of 175
Remembering +4 | -1
Sapphire is a mineral of:
View answer and explanation
Correct option: D
Al\mathrm{Al}
Option D (Al\mathrm{Al}) is correct because sapphire is a mineral form of aluminum oxide (Al2O3\mathrm{A}{\mathrm{l}_2}{\mathrm{O}_3}).
167 Medium
167 of 175
Remembering +4 | -1
The important step in the extraction of Metal from carbonate ore is :-
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Correct option: A
Calcination
Option A (Calcination) is correct because calcination is the process of heating a carbonate ore to decompose it into an oxide and carbon dioxide, which is an important step in metal extraction.
168 Medium
168 of 175
Remembering +4 | -1
The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is
View answer and explanation
Correct option: C
liquation
Option C (liquation) is correct because liquation is a refining method used when the metal has a lower melting point than its impurities.
169 Medium
169 of 175
Remembering +4 | -1
Pudding process is used in the manufacture of:
View answer and explanation
Correct option: C
Wrought iron
Option C (Wrought iron) is correct because the puddling process is specifically used to manufacture wrought iron by removing impurities from pig iron in a reverberatory furnace.
170 Medium
170 of 175
Remembering +4 | -1
The following equation represents a method of purification of nickel by,

Ni+2CO→320  KNi(CO)4→420  KNi+4COImpure                                                          Pure\begin{array}{l} \mathrm{Ni} + 2\mathrm{CO}\xrightarrow{{320\;K}}\mathrm{Ni}{\left( {\mathrm{CO}} \right)_4}\xrightarrow{{420\;K}}\mathrm{Ni} + 4\mathrm{CO}\\ Impure\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;Pure \end{array}

This method is:
View answer and explanation
Correct option: B
Mond’s process
Option B (Mond’s process) is correct because Mond's process is specifically used for the purification of nickel through the formation and decomposition of nickel carbonyl.
171 Medium
171 of 175
Understanding +4 | -1
After partial roasting, the sulphide of copper is reduced by:
View answer and explanation
Correct option: D
Self reduction
Option D (Self reduction) is correct because after partial roasting, some of the copper sulfide is converted to copper oxide, which then reacts with the remaining copper sulfide to form copper.
172 Medium
172 of 175
Remembering +4 | -1
Which of the following is the chief ore of copper?
View answer and explanation
Correct option: C
CuFeS2\mathrm{CuFe}{\mathrm{S}_2}
Option C (CuFeS2\mathrm{CuFe}{\mathrm{S}_2}) is correct because copper pyrite (chalcopyrite) is the most abundant and chief ore of copper.
173 Medium
173 of 175
Remembering +4 | -1
The compound used for gravimetric estimation of copper(II) is :
View answer and explanation
Correct option: A
Cu(SCN)2{Cu}({SCN})_2
The correct answer is A (Cu(SCN)2{Cu}({SCN})_2) because copper(II) ions are quantitatively precipitated as copper(II) thiocyanate, Cu(SCN)2{Cu}({SCN})_2, which is then weighed for gravimetric estimation.
174 Medium
174 of 175
Remembering +4 | -1
The process of extraction of Au and Ag ores is based on their solubility in:
View answer and explanation
Correct option: D
KCN
Option D (KCN) is correct because Au and Ag form soluble complexes with KCN, facilitating their extraction.
175 Medium
175 of 175
Remembering +4 | -1
Roasting is used in the extraction of:
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because roasting is a metallurgical process commonly used to extract metals from sulfide ores like galena, iron pyrite, and copper glance.
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