AIPMT 2009 | Electrochemistry Question 52 | Chemistry

AIPMT 2009

MCQ (Single Correct Answer)

-1

Al₂O₃ is reduced by electrolysis at low potentials and high currents. If 4.0 $$ \times $$ 10⁴ amperes of current is passed through molten Al₂O₃ for 6 hours, what mass of aluminium is product? (Assume 100% current efficiency, at mass of Al = 27 g mol^$$-$$1).

8.1 $$ \times $$ 10⁴ g

2.4 $$ \times $$ 10⁵ g

1.3 $$ \times $$ 10⁴ g

9.0 $$ \times $$ 10³ g

AIPMT 2008

MCQ (Single Correct Answer)

-1

Kohlrausch's law states that at

Infinite dilution, each ion makes definite contribution to conductance of an electrolyte whatever be the nature of the other ion of the electrolyte

Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte

Finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte

Infinite dilution each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.

AIPMT 2008

MCQ (Single Correct Answer)

-1

Standard free energies of formation (in kJ/mol) at 298 K are $$-$$237.2, $$-$$ 394.4 and $$-$$8.2 for H₂O_(l), CO_2(g) and pentane _(g) respectively. The value of E^o_cell for the pentane-oxygen fuel cell is

1.0968 V

0.0968 V

1.968 V

2.0968 V

AIPMT 2008

MCQ (Single Correct Answer)

-1

On the basis of the following E^o values, the strongest oxidizing agent is
[Fe(CN)₆]^4$$-$$ $$ \to $$ [Fe(CN)₆]^3$$-$$ + e^$$-$$; E^o = $$-$$0.35 V

Fe²⁺ $$ \to $$ Fe³⁺ + e^$$-$$; E^o = $$-$$0.77 V

Fe³⁺

[Fe(CN)₆]^3$$-$$

[Fe(CN)₆]^4$$-$$

Fe²⁺

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