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1
JEE Advanced 2021 Paper 1 Online
MCQ (More than One Correct Answer)
+4
-2
Change Language
The correct statement(s) related to the metal extraction processes is (are) :
A
A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO2
B
In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
C
Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper.
D
In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)2]
2
JEE Advanced 2021 Paper 1 Online
MCQ (More than One Correct Answer)
+4
-2
Change Language
A mixture of two salts is used to prepare a solution S, which gives the following results :

JEE Advanced 2021 Paper 1 Online Chemistry - Isolation of Elements Question 10 English
The correct option(s) for the salt mixture is (are)
A
Pb(NO3)2 and Zn(NO3)2
B
Pb(NO3)2 and Bi(NO3)3
C
AgNO3 and Bi(NO3)3
D
Pb(NO3)2 and Hg(NO3)2
3
JEE Advanced 2020 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
Change Language
Which among the following statement(s) is/are true for the extraction of aluminium from bauxite?
A
Hydrated Al2O3 precipitates, when CO2 is bubbled through a solution of sodium aluminate.
B
Addition of Na3AlF6 lowers the melting point of alumina.
C
CO2 is evolved at the anode during electrolysis.
D
The cathode is a steel vessel with a lining or carbon.
4
JEE Advanced 2019 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
Change Language
The cyanide process of gold extraction involves leaching out gold from its ore with CN$$-$$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s).
A
Q is O2
B
Z is [Zn(CN)4]2$$-$$
C
T is Zn
D
R is [Au(CN)4]$$-$$
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