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NCERT Solutions › Chemistry › Chapter 7

Chapter 7: Equilibrium

NCERT Solutions for CBSE Class 10 Chemistry — 58 solved questions with detailed explanations.

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Solved Questions

Q1. The pH of a 0.01 M HCl solution is:

Difficulty: Easy · Topic: pH

Solution

HCl is a strong acid. [H⁺] = 0.01 = 10⁻² M. pH = -log(10⁻²) = 2.

Q2. Le Chatelier's principle predicts that increasing pressure favors:

Difficulty: Easy · Topic: Le Chatelier

Solution

Increasing pressure shifts equilibrium toward the side with fewer moles of gas to reduce pressure.

Q3. The pH of 10⁻1 M HCl solution is:

Difficulty: Easy · Topic: pH Calculations

Solution

[H⁺] = 10⁻1 M. pH = -log[H⁺] = 1.

Q4. The pH of 10⁻2 M HCl solution is:

Difficulty: Easy · Topic: pH Calculations

Solution

[H⁺] = 10⁻2 M. pH = -log[H⁺] = 2.

Q5. The pH of 10⁻3 M HCl solution is:

Difficulty: Easy · Topic: pH Calculations

Solution

[H⁺] = 10⁻3 M. pH = -log[H⁺] = 3.

Q6. The pH of 10⁻4 M HCl solution is:

Difficulty: Easy · Topic: pH Calculations

Solution

[H⁺] = 10⁻4 M. pH = -log[H⁺] = 4.

Q7. The pH of 10⁻5 M HCl solution is:

Difficulty: Easy · Topic: pH Calculations

Solution

[H⁺] = 10⁻5 M. pH = -log[H⁺] = 5.

Q8. The pH of 10⁻6 M HCl solution is:

Difficulty: Easy · Topic: pH Calculations

Solution

[H⁺] = 10⁻6 M. pH = -log[H⁺] = 6.

Q9. The pH of 10⁻7 M HCl solution is:

Difficulty: Easy · Topic: pH Calculations

Solution

[H⁺] = 10⁻7 M. pH = -log[H⁺] = 7.

Q10. pH of 10^(-1) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-1)=1.

Q11. pH of 10^(-2) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-2)=2.

Q12. pH of 10^(-3) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-3)=3.

Q13. pH of 10^(-4) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-4)=4.

Q14. pH of 10^(-5) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-5)=5.

Q15. pH of 10^(-6) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-6)=6.

Q16. pH of 10^(-7) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-7)=7.

Q17. pH of 10^(-8) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-8)=8.

Q18. pH of 10^(-9) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-9)=9.

Q19. pH of 10^(-10) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-10)=10.

Q20. pH of 10^(-11) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-11)=11.

Q21. pH of 10^(-12) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-12)=12.

Q22. pH of 10^(-13) M HCl:

Difficulty: Easy · Topic: pH

Solution

pH=-log(10^-13)=13.

Q23. The common ion effect causes:

Difficulty: Easy-Medium · Topic: Common Ion Effect

Solution

Adding a common ion shifts dissolution equilibrium backward, decreasing solubility.

Q24. A buffer solution resists change in:

Difficulty: Easy-Medium · Topic: Ionic Equilibrium

Solution

pH.

Q25. Ka for a weak acid is:

Difficulty: Easy-Medium · Topic: Ionic Equilibrium

Solution

dissociation constant.

Q26. pH + pOH at 25°C equals:

Difficulty: Easy-Medium · Topic: Ionic Equilibrium

Solution

14.

Q27. The ionic product of water at 25°C is:

Difficulty: Easy-Medium · Topic: Ionic Equilibrium

Solution

10⁻¹⁴.

Q28. The pH of 0.1 M strong acid solution is:

Difficulty: Easy-Medium · Topic: pH

Solution

pH = -log[H⁺] = -log(0.1) = 1.0.

Q29. The pH of 0.01 M strong acid solution is:

Difficulty: Easy-Medium · Topic: pH

Solution

pH = -log[H⁺] = -log(0.01) = 2.0.

Q30. The pH of 0.001 M strong acid solution is:

Difficulty: Easy-Medium · Topic: pH

Solution

pH = -log[H⁺] = -log(0.001) = 3.0.

Q31. The pH of 0.0001 M strong acid solution is:

Difficulty: Easy-Medium · Topic: pH

Solution

pH = -log[H⁺] = -log(0.0001) = 4.0.

Q32. The pH of 0.5 M strong acid solution is:

Difficulty: Easy-Medium · Topic: pH

Solution

pH = -log[H⁺] = -log(0.5) = 0.3.

Q33. The pH of 0.05 M strong acid solution is:

Difficulty: Easy-Medium · Topic: pH

Solution

pH = -log[H⁺] = -log(0.05) = 1.3.

Q34. The pH of 0.005 M strong acid solution is:

Difficulty: Easy-Medium · Topic: pH

Solution

pH = -log[H⁺] = -log(0.005) = 2.3.

Q35. pH of 10^(-1) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=1, pH=14-1=13.

Q36. pH of 10^(-2) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=2, pH=14-2=12.

Q37. pH of 10^(-3) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=3, pH=14-3=11.

Q38. pH of 10^(-4) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=4, pH=14-4=10.

Q39. pH of 10^(-5) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=5, pH=14-5=9.

Q40. pH of 10^(-6) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=6, pH=14-6=8.

Q41. pH of 10^(-7) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=7, pH=14-7=7.

Q42. pH of 10^(-8) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=8, pH=14-8=6.

Q43. pH of 10^(-9) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=9, pH=14-9=5.

Q44. pH of 10^(-10) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=10, pH=14-10=4.

Q45. pH of 10^(-11) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=11, pH=14-11=3.

Q46. pH of 10^(-12) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=12, pH=14-12=2.

Q47. pH of 10^(-13) M NaOH:

Difficulty: Easy-Medium · Topic: pH

Solution

pOH=13, pH=14-13=1.

Q48. The solubility product of AgCl is 1.6 × 10⁻¹⁰. The solubility in mol/L is:

Difficulty: Medium · Topic: Solubility Product

Solution

AgCl → Ag⁺ + Cl⁻. Ksp = s². s = √(1.6×10⁻¹⁰) = 1.26×10⁻⁵ M.

Q49. For AB salt with Ksp=10^-5, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-5)=3.16e-03 M.

Q50. For AB salt with Ksp=10^-6, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-6)=1.00e-03 M.

Q51. For AB salt with Ksp=10^-7, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-7)=3.16e-04 M.

Q52. For AB salt with Ksp=10^-8, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-8)=1.00e-04 M.

Q53. For AB salt with Ksp=10^-9, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-9)=3.16e-05 M.

Q54. For AB salt with Ksp=10^-10, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-10)=1.00e-05 M.

Q55. For AB salt with Ksp=10^-11, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-11)=3.16e-06 M.

Q56. For AB salt with Ksp=10^-12, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-12)=1.00e-06 M.

Q57. For AB salt with Ksp=10^-13, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-13)=3.20e-07 M.

Q58. For AB salt with Ksp=10^-14, solubility s=

Difficulty: Medium · Topic: Ksp

Solution

Ksp=s², s=√Ksp=√(10^-14)=1.00e-07 M.

Other Chapters in Chemistry

Ch 1: Some Basic ConceptsCh 2: Structure of AtomCh 3: Classification of ElementsCh 4: Chemical BondingCh 5: States of MatterCh 6: ThermodynamicsCh 8: Redox ReactionsCh 9: HydrogenCh 10: s-Block ElementsCh 11: p-Block ElementsCh 12: Organic ChemistryCh 13: HydrocarbonsCh 14: Environmental Chemistry

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