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1
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The electrolytes usually used in the electroplating of gold and silver, respectively are :
A
[Au(CN)2]– and [Ag(CN)2]–
B
[Au(CN)2]– and [Ag(Cl)2]–
C
[Au(OH)4]– and [Ag(OH)2]–
D
[Au(NH3)2]– and [Ag(CN)2]–
2
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Hall- Heroult's process is given by :
A
Cu2+ (aq) + H2(g) $$ \to $$ Cu(s) + 2H+ (aq)
B
Cr2O3 + 2AI  $$ \to $$ Al2O3 + 2Cr
C
2Al2O3 + 3C  $$ \to $$ 4Al + 3CO2
D
ZnO + C   $$\buildrel {Coke,\,1673\,K} \over \longrightarrow $$ Zn + CO
3
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The correct statement regarding the given Ellingham diagram is :

JEE Main 2019 (Online) 9th January Evening Slot Chemistry - Isolation of Elements Question 99 English
A
At 1400oC, Al can be used for the extraction of Zn from ZnO
B
At 500oC, coke can be used for the extraction of Zn from ZnO
C
Coke cannot be used for the extraction of Cu from Cu2O.
D
At 800oC, Cu can be used for the extraction of Zn from ZnO.
4
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The ore that contains both iron and copper is :
A
Copper Pyrites
B
Malachite
C
Dolomite
D
Azurite
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