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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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Showing 241-257 of 257 questions
241 Hard
241 of 257
Analyzing +4 | -1
Which series of reactions correctly represents chemical relations related to iron and its compound?
View answer and explanation
Correct option: D
Fe→O2,  HeatFe3O4→CO,  600∘ C FeO→CO,  700∘ CFe Fe\xrightarrow{{{O_2},\,\,Heat}}F{e_3}{O_4}\xrightarrow{{CO,\,\,600^\circ \,C}}\,FeO\xrightarrow{{CO,\,\,700^\circ \,C}}Fe\,
Option D (Fe→O2,  HeatFe3O4→CO,  600∘ C FeO→CO,  700∘ CFe Fe\xrightarrow{{{O_2},\,\,Heat}}F{e_3}{O_4}\xrightarrow{{CO,\,\,600^\circ \,C}}\,FeO\xrightarrow{{CO,\,\,700^\circ \,C}}Fe\,) is correct because it accurately represents the chemical reactions related to iron and its compounds through oxidation and reduction processes.
242 Easy
242 of 257
Remembering +4 | -1
Specific gravity of slag is:
View answer and explanation
Correct option: B
Always less than molten metal
Option B (Always less than molten metal) is correct because slag floats on top of molten metal, indicating a lower density and thus lower specific gravity.
243 Easy
243 of 257
Remembering +4 | -1
Muffle furnace is used in the metallurgy of
View answer and explanation
Correct option: A
ZnZn
Option A (ZnZn) is correct because a muffle furnace is specifically used in the metallurgy of Zinc.
244 Medium
244 of 257
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}).
245 Medium
245 of 257
Remembering +4 | -1
The important step in the extraction of Metal from carbonate ore is :-
View answer and explanation
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.
246 Medium
246 of 257
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.
247 Medium
247 of 257
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.
248 Medium
248 of 257
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.
249 Easy
249 of 257
Remembering +4 | -1
The ore that is concentrated by forth floatation process is
View answer and explanation
Correct option: B
Cinnabar
Option B (Cinnabar) is correct because Cinnabar (HgS) is a sulfide ore and froth flotation is commonly used for concentrating sulfide ores.
250 Easy
250 of 257
Remembering +4 | -1
Black Jack is an ore of
View answer and explanation
Correct option: C
Zn
Option C (Zn) is correct because Black Jack is a common name for zinc sulfide (ZnS), an ore of zinc.
251 Medium
251 of 257
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.
252 Medium
252 of 257
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.
253 Medium
253 of 257
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.
254 Medium
254 of 257
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.
255 Medium
255 of 257
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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256 Easy
256 of 257
Remembering +4 | -1
Which of the following ores does not contains oxygen?
View answer and explanation
Correct option: B
Chalcopyrite
Option B (Chalcopyrite) is correct because Chalcopyrite (CuFeS2\mathrm{CuFeS}_2) is a sulfide mineral and does not contain oxygen in its chemical formula.
257 Easy
257 of 257
Remembering +4 | -1
The ore magnesite is:
View answer and explanation
Correct option: D
MgCO3\mathrm{MgC}{\mathrm{O}_3}
Option D (MgCO3\mathrm{MgC}{\mathrm{O}_3}) is correct because magnesite is a mineral composed of magnesium carbonate (MgCO3\mathrm{MgC}{\mathrm{O}_3}).
Revision notes and key takeaways

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