Electrochemistry

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Electrochemistry - 03

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Q1. In the electrochemical reaction, on increasing the concentration of Fe+2 ions *

1 point

alters the pH of the solution

decreases the cell emf

increases cell emf

increases the current flow

Q2. The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be (Given F = 96500 C mol–1; R = 8.314JK–1mol–1) *

1 point

2 x 10^11

1 x 10^2

1 x 10^10

4 x 10^12

Q3. The value of electrode potential (10–4 M)H+ | H2 (1 atm) | Pt at 298 K would be *

1 point

+ 0.236 V

– 0.236 V

+ 0.404 V

– 0.476 V

Q4. The standard emf of a cell, involving one electron change is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is (F = 96500 C mol–1) *

1 point

1.0 × 10^1

1.0 × 10^10

1.0 × 10^5

1.0 ×10^30

Q5. Calculate the EMF of the cell *

1 point

– 0.70

– 0.82

+ 0.73

– 0.79

Q6. The unit of equivalent conductivity is *

1 point

ohm cm

ohm–1 cm2 (g equivalent)–1

ohm cm2 (g equivalent)

S cm–2

Q7. Specific conductance of 0.1 M HNO3 is 6.3×10–2 ohm–1 cm–1. The molar conductance of the solution is *

1 point

630 ohm–1 cm2

6300 ohm–1 cm2

100 ohm–1 cm2

515 ohm–1 cm2

Q8. The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm–1cm–1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be *

1 point

0.66 cm–1

0.142 cm–1

0.918 cm–1

1.12 cm–1

Q9. The unit of specific conductivity is *

1 point

ohm–1 cm

ohm cm–2

ohm cm–1

ohm–1 cm–1

Q10. Which of the following solutions of KCl will have the highest value of specific conductance? *

1 point

0.1 N

1.0 ×10^–2 N

1.0 N

1.0 ×10^–3 N

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