1
JEE Main 2015 (Offline)
+4
-1
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
A
Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity
B
Al3+ is reduced at the cathode to form Al
C
Na3AlF6 serves as the electrolyte
D
CO and CO2 are produced in this process
2
AIEEE 2012
+4
-1
Which method of purification is represented by the following equation :
Ti (s) + 2I2 (g) $$\buildrel {523K} \over \longrightarrow$$ TiI4 (g) $$\buildrel {1700K} \over \longrightarrow$$ Ti (s) + 2I2 (g)
A
zone refining
B
cupellation
C
Poling
D
Van Arkel
3
AIEEE 2008
+4
-1
Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
A
Metal sulphides are thermodynamically more stable than CS2
B
CO2 is thermodynamically more stable than CS2
C
Metal sulphides are less stable than the corresponding oxides
D
CO2 is more volatile than CS2
4
AIEEE 2005
+4
-1
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are
A
Sn and Ag
B
Pb and Zn
C
Ag and Au
D
Fe and Ni
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