1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al3+ + 3e- $$\to$$ Alo To prepare 5.12 kg of aluminium metal by this method would require
A
5.49 $$\times$$ 107 C of electricity
B
1.83 $$\times$$ 107 C of electricity
C
5.49 $$\times$$ 104 C of electricity
D
5.49 $$\times$$ 101 C of electricity
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The highest electrical conductivity of the following aqueous solutions is of :
A
0.1 M acetic acid
B
0.1 M chloroacetic acid
C
0.1 M fluoroacetic acid
D
0.1 M difluoroacetic acid
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Electrolyte: KCl KNO3 HCl NaOAc NaCl
$${ \wedge ^\infty }(Sc{m^2}mo{l^{ - 1}}):$$
149.9 145 426.2 91 126.5
Calculate $$ \wedge _{HOAc}^\infty $$ Using appropriate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25oC
A
517.2
B
552.7
C
390.7
D
217.5
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to :
A
generate heat
B
remove adsorbed oxygen from electrode surfaces
C
produce high purity water
D
create potential difference between the two electrodes
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