General Practical Chemistry I — 2019 Past Questions

University of Ilorin CHM107: 17 questions.

Topics: Acid-Base Titration, Precipitation Titration, Treatment of Analytical Data, Volumetric Analysis, Scientific Data and Chemical Experiments, Oxidation-Reduction Titration

1. Titration of H₂SO₃ with NaOH requires what indicator?
   1. Phenolphthalein
   2. Methyl orange
   3. Bromothymol blue
   4. Alizarin yellow
2. The most suitable indicator used in gravimetric titration is?
   1. Sintered glass/Büchner funnel
   2. Adsorption indicator
   3. Redox indicator
   4. pH meter
3. Why is KOH not used in standardization?
   1. It reacts with air (unstable)
   2. It is too expensive
   3. It is a weak base
   4. It forms precipitates
4. A gravimetric method where particulate is measured is called?
   1. Particulate gravimetry
   2. Volatilization gravimetry
   3. Electrogravimetry
   4. Precipitation gravimetry
5. Titration of weak acid and weak base requires...
   1. No suitable indicator
   2. Phenolphthalein
   3. Methyl red
   4. Universal indicator
6. What is the structure of oxime?
   1. 8-Hydroxyquinoline
   2. 2-Hydroxyquinone
   3. O-Hydroxyquinone
   4. 1,2-Naphthoquinone
7. The color change in Volhard titration is?
   1. Red
   2. Yellow
   3. Blue
   4. Colorless
8. The pH of Volhard titration is typically?
   1. Acidic (Red)
   2. Neutral (Green)
   3. Basic (Blue)
   4. Strongly acidic (Yellow)
9. The color changes in acidic medium for bromothymol blue and bromocresol blue are?
   1. Yellow/Yellow
   2. Blue/Blue
   3. Red/Red
   4. Green/Green
10. Titration in Mohr method is done at the pH of?
    1. 7 (Neutral)
    2. 4 (Acidic)
    3. 9 (Basic)
    4. 11 (Strongly basic)
11. Which of the following is not a gravimetric method?
    1. Electronic gravimetry
    2. Volatilization
    3. Particulate
    4. None of the above
12. What is the color of methyl orange at pH 8?
    1. Yellow
    2. Red
    3. Orange
    4. Blue
13. What is the color change for the endpoint of Fajan's method?
    1. Pink to colorless
    2. Yellow to red
    3. Green to blue
    4. White to pink
14. Titration of CH₃COOH and NaOH uses which indicator?
    1. Phenolphthalein
    2. Methyl orange
    3. Ferric ion
    4. Potassium chromate
15. A solvent is a liquid in a solution. True or False?
    1. True
    2. False
    3. Depends on concentration
    4. Only for aqueous solutions
16. Which acid is used in the titration of KMnO₄?
    1. H₂SO₄
    2. HCl and HNO₃
    3. HNO₃
    4. None of the above
17. A substance that resists change in pH in a solution is known as?
    1. Buffer
    2. Oxide
    3. Chromium salt
    4. Acid

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