AIEEE 2005 | Electrochemistry Question 164 | Chemistry

Aluminium oxide may be electrolysed at 1000^oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al³⁺ + 3e^- $$\to$$ Al^o To prepare 5.12 kg of aluminium metal by this method would require

5.49 $$\times$$ 10⁷ C of electricity

1.83 $$\times$$ 10⁷ C of electricity

5.49 $$\times$$ 10⁴ C of electricity

5.49 $$\times$$ 10¹ C of electricity

AIEEE 2005

MCQ (Single Correct Answer)

-1

The highest electrical conductivity of the following aqueous solutions is of :

0.1 M acetic acid

0.1 M chloroacetic acid

0.1 M fluoroacetic acid

0.1 M difluoroacetic acid

AIEEE 2005

MCQ (Single Correct Answer)

-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 25^oC

517.2

552.7

390.7

217.5

AIEEE 2004

MCQ (Single Correct Answer)

-1

In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to :

generate heat

remove adsorbed oxygen from electrode surfaces

produce high purity water

create potential difference between the two electrodes

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