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Chapter 3: Electrochemistry

NCERT Solutions for CBSE Class 10 Chemistry — 52 solved questions with detailed explanations.

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Solved Questions

Q1. The standard electrode potential of hydrogen electrode is:

1.0 V
0.0 V
-1.0 V
0.5 V

Difficulty: Easy · Topic: Standard Potential

Solution

By convention, E°(H⁺/H₂) = 0.00 V. This is the reference for all standard electrode potentials.

Q2. Faraday's first law of electrolysis states that the mass deposited is proportional to:

Voltage applied
Current × time
Resistance
Concentration

Difficulty: Easy · Topic: Faraday's Laws

Solution

m = ZIt = (M×I×t)/(n×F). Mass deposited ∝ charge passed (Q = It).

Q3. For a galvanic cell, ΔG° is related to E° by:

ΔG° = nFE°
ΔG° = -nFE°
ΔG° = nE°/F
ΔG° = -E°/nF

Difficulty: Easy-Medium · Topic: Gibbs and EMF

Solution

ΔG° = -nFE°. For a spontaneous cell (E° > 0), ΔG° < 0.

Q4. Mass deposited with I=2A for 30 min (Z=0.00033 g/C) is:

Difficulty: Easy-Medium · Topic: Electrolysis

Solution

m = ZIt = 0.00033×2×30×60 = 1.188 g.

Q5. Mass deposited with I=3A for 20 min (Z=0.00033 g/C) is:

Difficulty: Easy-Medium · Topic: Electrolysis

Solution

m = ZIt = 0.00033×3×20×60 = 1.188 g.

Q6. Mass deposited with I=5A for 10 min (Z=0.0006 g/C) is:

Difficulty: Easy-Medium · Topic: Electrolysis

Solution

m = ZIt = 0.0006×5×10×60 = 1.8 g.

Q7. Mass deposited with I=1A for 60 min (Z=0.0003 g/C) is:

Difficulty: Easy-Medium · Topic: Electrolysis

Solution

m = ZIt = 0.0003×1×60×60 = 1.08 g.

Q8. Mass deposited with I=4A for 15 min (Z=0.0005 g/C) is:

Difficulty: Easy-Medium · Topic: Electrolysis

Solution

m = ZIt = 0.0005×4×15×60 = 1.8 g.

Q9. For a cell with E°=0.34 V and n=2, ΔG° is (F=96500 C/mol):

Difficulty: Medium · Topic: Gibbs Energy

Solution

ΔG° = -nFE° = -2×96500×0.34 = -65620 J.

Q10. For a cell with E°=0.76 V and n=1, ΔG° is (F=96500 C/mol):

Difficulty: Medium · Topic: Gibbs Energy

Solution

ΔG° = -nFE° = -1×96500×0.76 = -73340 J.

Q11. For a cell with E°=1.1 V and n=2, ΔG° is (F=96500 C/mol):

Difficulty: Medium · Topic: Gibbs Energy

Solution

ΔG° = -nFE° = -2×96500×1.1 = -212300 J.

Q12. For a cell with E°=0.44 V and n=3, ΔG° is (F=96500 C/mol):

Difficulty: Medium · Topic: Gibbs Energy

Solution

ΔG° = -nFE° = -3×96500×0.44 = -127380 J.

Q13. Ag deposited: I=1A, t=10min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*1*600/96500=0.6715 g.

Q14. Ag deposited: I=1A, t=20min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*1*1200/96500=1.343 g.

Q15. Ag deposited: I=1A, t=30min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*1*1800/96500=2.0145 g.

Q16. Ag deposited: I=1A, t=60min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*1*3600/96500=4.029 g.

Q17. Ag deposited: I=1A, t=120min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*1*7200/96500=8.058 g.

Q18. Ag deposited: I=2A, t=10min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*2*600/96500=1.343 g.

Q19. Ag deposited: I=2A, t=20min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*2*1200/96500=2.686 g.

Q20. Ag deposited: I=2A, t=30min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*2*1800/96500=4.029 g.

Q21. Ag deposited: I=2A, t=60min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*2*3600/96500=8.058 g.

Q22. Ag deposited: I=2A, t=120min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*2*7200/96500=16.1161 g.

Q23. Ag deposited: I=3A, t=10min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*3*600/96500=2.0145 g.

Q24. Ag deposited: I=3A, t=20min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*3*1200/96500=4.029 g.

Q25. Ag deposited: I=3A, t=30min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*3*1800/96500=6.0435 g.

Q26. Ag deposited: I=3A, t=60min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*3*3600/96500=12.087 g.

Q27. Ag deposited: I=3A, t=120min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*3*7200/96500=24.1741 g.

Q28. Ag deposited: I=5A, t=10min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*5*600/96500=3.3575 g.

Q29. Ag deposited: I=5A, t=20min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*5*1200/96500=6.715 g.

Q30. Ag deposited: I=5A, t=30min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*5*1800/96500=10.0725 g.

Q31. Ag deposited: I=5A, t=60min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*5*3600/96500=20.1451 g.

Q32. Ag deposited: I=5A, t=120min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*5*7200/96500=40.2902 g.

Q33. Ag deposited: I=10A, t=10min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*10*600/96500=6.715 g.

Q34. Ag deposited: I=10A, t=20min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*10*1200/96500=13.4301 g.

Q35. Ag deposited: I=10A, t=30min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*10*1800/96500=20.1451 g.

Q36. Ag deposited: I=10A, t=60min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*10*3600/96500=40.2902 g.

Q37. Ag deposited: I=10A, t=120min (Ag: 108g/mol, n=1):

Difficulty: Medium · Topic: Electrolysis

Solution

m=MIt/(nF)=108*10*7200/96500=80.5803 g.

Q38. Cell E°=0.34V, n=1. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -1*96500*0.34/1000 = -32.81 kJ.

Q39. Cell E°=0.34V, n=2. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -2*96500*0.34/1000 = -65.62 kJ.

Q40. Cell E°=0.34V, n=3. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -3*96500*0.34/1000 = -98.43 kJ.

Q41. Cell E°=0.76V, n=1. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -1*96500*0.76/1000 = -73.34 kJ.

Q42. Cell E°=0.76V, n=2. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -2*96500*0.76/1000 = -146.68 kJ.

Q43. Cell E°=0.76V, n=3. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -3*96500*0.76/1000 = -220.02 kJ.

Q44. Cell E°=1.1V, n=1. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -1*96500*1.1/1000 = -106.15 kJ.

Q45. Cell E°=1.1V, n=2. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -2*96500*1.1/1000 = -212.3 kJ.

Q46. Cell E°=1.1V, n=3. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -3*96500*1.1/1000 = -318.45 kJ.

Q47. Cell E°=0.44V, n=1. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -1*96500*0.44/1000 = -42.46 kJ.

Q48. Cell E°=0.44V, n=2. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -2*96500*0.44/1000 = -84.92 kJ.

Q49. Cell E°=0.44V, n=3. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -3*96500*0.44/1000 = -127.38 kJ.

Q50. Cell E°=0.8V, n=1. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -1*96500*0.8/1000 = -77.2 kJ.

Q51. Cell E°=0.8V, n=2. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -2*96500*0.8/1000 = -154.4 kJ.

Q52. Cell E°=0.8V, n=3. ΔG° (kJ):

Difficulty: Medium · Topic: Electrochemistry

Solution

ΔG° = -nFE° = -3*96500*0.8/1000 = -231.6 kJ.

Other Chapters in Chemistry

Ch 1: Solid State Ch 2: Solutions Ch 4: Chemical Kinetics Ch 5: Surface Chemistry Ch 6: Isolation of Elements Ch 7: p-Block Elements Ch 8: d & f Block Elements Ch 9: Coordination Compounds Ch 10: Haloalkanes & Haloarenes Ch 11: Alcohols Phenols Ethers Ch 12: Aldehydes Ketones Ch 13: Amines Ch 14: Biomolecules Ch 15: Polymers Ch 16: Chemistry in Everyday Life

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