AIEEE 2005 | Electrochemistry Question 208 | 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

For a spontaneous reaction the ∆G , equilibrium constant (K) and $$E_{cell}^o$$ will be respectively

-ve, >1, +ve

+ve, >1, -ve

-ve, <1, -ve

-ve, >1, -ve

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

AIEEE 2004

MCQ (Single Correct Answer)

-1

Consider the following E^o values

$$E_{F{e^{3 + }}/F{e^{2 + }}}^o$$ = 0.77 V;

$$E_{S{n^{2 + }}/S{n}}^o$$ = -0.14 V

Under standard conditions the potential for the reaction

Sn(s) + 2Fe³⁺(aq) $$\to$$ 2Fe²⁺(aq) + Sn²⁺(aq) is :

1.68 V

0.63 V

0.91 V

1.40 V

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