AIPMT 2003 | Electrochemistry Question 64 | Chemistry

AIPMT 2003

MCQ (Single Correct Answer)

-1

On the basis of the information available from the reaction,

4/3Al + O₂ $$ \to $$ 2/3Al₂O₃, $$\Delta $$G = $$-$$ 827 kJ mol^$$-$$1 of O₂,

the minimum e.m.f. required to carry out an electrolysis of Al₂O₃ is
(F = 96500 C mol^$$-$$1)

2.14 V

4.28 V

6.42 V

8.56 V

AIPMT 2002

MCQ (Single Correct Answer)

-1

In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam

Hg is more inert than Pt

More voltage is required to reduce H⁺ at Hg than at Pt

Na is dissolved in Hg while it does not dissolve in Pt

Conc. of H⁺ ions is larger when Pt electrode is taken.

AIPMT 2001

MCQ (Single Correct Answer)

-1

Standard electrode potentials are
Fe²⁺/Fe [E^o = $$-$$0.44] and
Fe³⁺/Fe²⁺[ E^o = 0.77];
If Fe²⁺, Fe³⁺ and Fe blocks are kept together, then

Fe³⁺ increases

Fe³⁺ decreases

Fe²⁺/Fe³⁺ remains unchanged

Fe²⁺ decreases.

AIPMT 2000

MCQ (Single Correct Answer)

-1

Cell reaction is spontaneous when

$$\Delta $$G^o is negative

$$\Delta $$G^o is positive

$$\Delta $$E^o_red is positive

$$\Delta $$E^o_red is negative

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