Electrochemistry Quiz 4 – Punjab Meritorious School Preparation Portal

Welcome to your 24th Sep Electrochemistry Quiz 4 CBT TEST

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– 89.0 kJ

– 89.0 J

– 44.5 kJ

– 98.0 kJ

Standard electrode potential of three metals X, Y and Z are – 1.2 V, +0.5 V and – 3.0 V, respectively. The reducing power of these metals will be:

Y > Z > X

Z > X > Y

X > Y > Z

X > Y >Z

Standard free energies of formation (in KJ/mol) at 298K are – 237.2, – 394.4 and – 8.2 for H₂O (l), CO₂(g)and pentane (g), respectively. The value Eº_cellfor the pentane-oxygen fuel cell is:

1.968 V

2.0968 V

1.0968 V

0.0968 V

Consider the following relations for emf of an electrochemical cell:

(i) Emf of cell = (Oxidation potential of anode) – (Reduction potential of cathode)

(ii) Emf of cell (Oxidation potential of anode) + (Reduction potential of cathode)

(iii) emf of cell = (Reduction potential of anode) + (Reduction potential of cathode)

(iv) emf of cell = (Oxidation potential of anode) – (Oxidation potential of cathode)

Which of the above relations are correct?

(ii) and (iv)

(iii) and(i)

(i) and (ii)

(iii) and (iv)

Given:

Cu²⁺+ 2e^-→ Cu, Eº = 0.337V
Cu²⁺+ 2e^-→ Cu⁺, Eº =0.153 V

Electrode potential, Eº for the reaction;

Cu⁺+ e– →Cu, will be:

0.90 V

0.30 V

0.38 V

0.52 V

During the charging of lead storage battery, the reaction at anode is represented by:

During the charging of lead storage battery, the reaction at anode is represented by:

During the charging of lead storage battery, the reaction at anode is represented by:

During the charging of lead storage battery, the reaction at anode is represented by:

During the charging of lead storage battery, the reaction at anode is represented by:

The efficiency of a fuel cell is given by

The efficiency of a fuel cell is given by

The efficiency of a fuel cell is given by

The efficiency of a fuel cell is given by

The efficiency of a fuel cell is given by

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