Summary

• Description:

  The MS Word document comprises Bunaf Cluster Examination Chemistry Paper 3 (Practical) June 2026 Pre-Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 3 (Practical) examination. This paper tests Form 4 candidates on quantitative analysis through titration, requiring accurate experimental technique, data recording, and stepwise mole calculations — skills that are central to the KCSE practical Chemistry assessment.

  • Month Administered: June 2026
  • Duration: 2¼ hours
  • Total Marks: 40
  • Number of Questions: 3 (all compulsory)
  • Structure:
    • Question 1 – 17 marks
    • Question 2 – 11 marks
    • Question 3 – 12 marks

  It covers the following topics:

  • Question 1 — Redox Titration (Potassium Manganate(VII) / Iron(II) / Dibasic Acid):
    • Standardising KMnO₄ solution (A) using ammonium iron(II) sulphate solution (B)
    • Recording titration results in a table (3 trials)
    • Calculating average volume, concentration of B in mol/L, moles of Fe²⁺ ions, and concentration of MnO₄⁻ ions using the redox equation
    • Titrating standardised KMnO₄ against a hot dibasic acid solution (C)
    • Determining the concentration of C and molecular mass of X in H₂X·2H₂O
  • Questions 2–3 — Additional practical Chemistry tasks involving identification, analysis, or further quantitative work
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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