General Practical Chemistry I — 2025 Past Questions

University of Ilorin CHM107: 51 questions.

Topics: Oxidation-Reduction Titration, Volumetric Analysis, Basic Glassware and Equipment in the Laboratory, Acid-Base Titration, Scientific Data and Chemical Experiments, General Laboratory Rules and Safety Procedures, Precipitation Titration, Treatment of Analytical Data

  1. The balanced half equation between MnO₄⁻ and Fe²⁺ is:
    1. MnO₄⁻ + 8H⁺ + 5Fe²⁺ → Mn²⁺ + 4H₂O + 5Fe³⁺
    2. MnO₄⁻ + 4H⁺ + 3Fe²⁺ → Mn²⁺ + 2H₂O + 3Fe³⁺
    3. MnO₄⁻ + 2H⁺ + Fe²⁺ → MnO₂ + H₂O + Fe³⁺
    4. MnO₄⁻ + 6H⁺ + 7Fe²⁺ → Mn²⁺ + 3H₂O + 7Fe³⁺
  2. The products of K₂CO₃ and H₂SO₄ are:
    1. K₂SO₄ + CO₂ + H₂O
    2. KHSO₄ + KHCO₃
    3. K₂SO₄ + H₂CO₃
    4. KOH + CO₂ + H₂SO₃
  3. What is the most critical factor in calibration of glassware?
    1. Shape of glassware
    2. Colour
    3. Temperature
    4. Manufacturer
  4. What is the pH range of murexide?
    1. 1-5
    2. 6-13
    3. 14-16
    4. 2-4
  5. What is used to standardize EDTA?
    1. KMnO₄
    2. Ca-EDTA
    3. ZnSO₄
    4. Na₂CO₃
  6. What happens to iodine in iodometry?
    1. It is oxidized to IO₄⁻
    2. It is reduced to I⁻
    3. It forms I₃⁻
    4. It remains as I₂
  7. What is reduction?
    1. Removal of hydrogen and addition of oxygen
    2. Removal of oxygen and addition of hydrogen
    3. Gain of electrons
    4. Both B and C
  8. In the reaction Fe + SnCl₂ → Fe²⁺ + SnCl₄, what is the reductant?
    1. Fe
    2. SnCl₂
    3. Fe²⁺
    4. SnCl₄
  9. In the reaction Fe + SnCl₂ → Fe²⁺ + SnCl₄, what is the oxidant?
    1. Fe
    2. SnCl₂
    3. Fe²⁺
    4. SnCl₄
  10. Calculate concentration (g/L) if 8g of a substance is diluted to 250mL with distilled water.
    1. 16 g/L
    2. 32 g/L
    3. 8 g/L
    4. 4 g/L
  11. In acidic medium, what does KMnO₄ act as?
    1. Oxidizing agent
    2. Catalyst
    3. Reducing agent
    4. Buffer
  12. The layer left after Fajan’s titration is:
    1. Neutral
    2. Acidic
    3. Alkaline
    4. Colloidal
  13. Random errors are:
    1. Determinate
    2. Indeterminate
    3. Systematic
    4. Avoidable
  14. Which of these is a weak acid?
    1. HCl
    2. H₂SO₄
    3. CH₃COOH
    4. HNO₃
  15. The equivalent weight of 2Fe₂(SO₄)₃ → Fe(OH)₂ is given by the molecular mass divided by:
    1. 1 unit
    2. 4 units
    3. 2 units
    4. 6 units
  16. What is the reading accuracy of a burette and pipette?
    1. ±0.01 mL; ±0.02 mL
    2. ±0.05 mL; ±0.01 mL
    3. ±0.10 mL; ±0.05 mL
    4. ±0.02 mL; ±0.01 mL
  17. A ligand with two donor atoms is called:
    1. Monodentate
    2. Bidentate
    3. Hexadentate
    4. Tetradentate
  18. In dilute H₂SO₄, K₂Cr₂O₇ is reduced to Cr₂(SO₄)₃. The equivalent weight of K₂Cr₂O₇ is:
    1. Molar mass/2
    2. Molar mass/3
    3. Molar mass/6
    4. Molar mass/1
  19. What is the relative error (%) for data [2.4, 2.1, 2.1, 2.3, 1.5] if the accepted value is 2.0?
    1. 0.004%
    2. 0.04%
    3. 4.0%
    4. 40%
  20. The theory explaining color change due to ionization is:
    1. Quinonoid theory
    2. Resonance theory
    3. Chromophore theory
    4. Ostwald theory
  21. Which titration is NOT associated with EDTA?
    1. Back titration
    2. Blank titration
    3. Displacement titration
    4. Redox titration
  22. A common ligand in complexometric titration is:
    1. Ethyl triammonium bromide
    2. EDTA
    3. Dimethylglyoxime
    4. Nitrilotriacetic acid
  23. In complexometric titration, a chelating agent is used for:
    1. Maintain the pH of the solution
    2. To increase the rate of reaction
    3. To form colored ions with the base
    4. To form stable complexes with metal ions
  24. Using high temperature in volumetric calibration leads to:
    1. No effect on calibration
    2. Increase in volume delivered
    3. Decrease in volume delivered
    4. Constant volume delivered
  25. What is the concentration (g/L) of 7g H₂SO₄ in 250mL?
    1. 14 g/L
    2. 28 g/L
    3. 7 g/L
    4. 3.5 g/L
  26. Complexometric titration is NOT used in:
    1. Determining pH
    2. Determining cations
    3. Water hardness testing
    4. Ca²⁺ quantification
  27. Calmagite is NOT useful for detecting which metal?
    1. Ca
    2. Ni
    3. Mg
    4. Zn
  28. The solution in the burette is called:
    1. Analyte
    2. Titrand
    3. Titrant
    4. Solvent
  29. The products of KMnO₄ + oxalic acid (dil. H₂SO₄) are:
    1. K₂SO₄ + MnSO₄ + H₂O + CO₂
    2. K₂C₂O₄ + MnO₂ + H₂O
    3. KMnO₄ + H₂C₂O₄ + H₂O
    4. No reaction
  30. What volume of 12M HNO₃ is needed to prepare 500mL of 3M solution?
    1. 125 mL
    2. 250 mL
    3. 62.5 mL
    4. 500 mL
  31. The mole ratio of base (KOH) to acid (H₂SO₄) is:
    1. 1:1
    2. 1:2
    3. 2:2
    4. 2:1
  32. In the reaction: Metal-Indicator + EDTA → ?
    1. Stable metal-indicator complex
    2. Stable indicator
    3. Less stable indicator
    4. Less stable metal-indicator complex
  33. The oxidation number change of Mn in KMnO₄ → MnSO₄ is:
    1. +7 to +2
    2. +3 to +4
    3. +2 to +3
    4. +6 to +2
  34. Excess NaCN in a reaction acts as a:
    1. Titrant
    2. Titrand
    3. Masking agent
    4. Demasking agent
  35. 35 mL of 0.125M HCl neutralizes 25 mL KOH. The KOH concentration is:
    1. 0.175 M
    2. 0.125 M
    3. 0.250 M
    4. 0.100 M
  36. The mass of 0.2N NaOH in 500 cm³ is:
    1. 2 g
    2. 4 g
    3. 6 g
    4. 8 g
  37. Decreased atmospheric pressure causes:
    1. Higher boiling point
    2. No effect
    3. Lower boiling point
    4. Variable boiling point
  38. Reduction involves:
    1. Decreased valency & increased electrons
    2. Increased valency & decreased electrons
    3. No valency change
    4. Electron loss
  39. Volhard’s method uses which reagent?
    1. H₂SO₄
    2. HNO₃
    3. HCl
    4. H₃PO₄
  40. Which acid CANNOT be used with KMnO₄?
    1. H₂SO₄
    2. HClO₃
    3. HCl
    4. HNO₃
  41. A condition favoring complexometric titration is:
    1. Metal-EDTA complex > Metal-Indicator stability
    2. Metal-Indicator > Metal-EDTA stability
    3. No indicator needed
    4. Low pH
  42. The structure of EDTA is:
    1. Hexadentate ligand with 4 carboxyl & 2 amine groups
    2. Tetradentate with 2 carboxyl groups
    3. Bidentate with 1 amine group
    4. Monodentate
  43. Which is NOT necessary for redox titration?
    1. Fast/complete reaction
    2. Strong acid/base
    3. Suitable indicator
    4. Visible color change
  44. Red litmus in K₂CO₃ turns:
    1. Red
    2. Blue
    3. Yellow
    4. No change
  45. The purpose of a pipette calibration certificate is to:
    1. Verify volume accuracy
    2. Confirm manufacturer
    3. Indicate color code
    4. List material type
  46. A Bunsen burner is used for:
    1. Flame operations
    2. Heating to specific temps
    3. Sterilization
    4. All of the above
  47. Which glassware is NOT typically calibrated?
    1. Burette
    2. Beaker
    3. Pipette
    4. Volumetric flask
  48. A hot plate’s function is:
    1. Heating materials
    2. Precise temp control
    3. Both A and B
    4. None
  49. Qualitative analysis identifies:
    1. Compound identity
    2. Concentration
    3. Volume
    4. Purity
  50. A watch glass is used to:
    1. Cover beakers
    2. Evaporate liquids
    3. Hold small samples
    4. All of the above
  51. What unit of measurement is used in the calibration of glassware?
    1. Grams (g)
    2. Liters (L)
    3. Milliliters (mL)
    4. Moles (mol)

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