CHE 113: Chemistry Practical pass question paper

 CHE 113: Chemistry Practical Examination (NCE One)

1. Which apparatus is used to measure **exactly 25.0 mL** of a liquid?  

   a) Beaker  

   b) Graduated cylinder  

   c) Volumetric pipette

   d) Burette  

2. A primary standard in titration must be:  

   a) Hygroscopic  

   b) Stable and pure  

   c) Highly reactive  

   d) Colored  

3. The flame color for sodium ions is:  

   a) Blue  

   b) Yellow  

   c) Green  

   d) Red  

4. Which indicator is used in a strong acid-strong base titration?  

   a) Litmus  

   b) Methyl orange  

   c) Phenolphthalein 

   d) Bromothymol blue  

5. Broken glassware should be disposed of in:  

   a) Regular trash  

   b) Sharps container 

   c) Sink  

   d) Recycling bin  

6. The gas that turns limewater milky is:  

   a) Hydrogen  

   b) Oxygen  

   c) Carbon dioxide  

   d) Ammonia  

7. The purpose of a desiccator is to:  

   a) Measure volume  

   b) Store dry substances

   c) Heat solutions  

   d) Mix chemicals  

8. Which separation technique uses boiling points?  

   a) Filtration  

   b) Distillation  

   c) Decantation  

   d) Centrifugation  

9. To test for sulfate ions, add:  

   a) Silver nitrate  

   b) Barium chloride  

   c) Litmus paper  

   d) Sodium hydroxide  

10. The term "taring" refers to:  

    a) Measuring temperature  

    b) Zeroing a balance with a container  

    c) Cleaning glassware  

    d) Heating a solution  

11. The immediate action for an acid spill on the skin is to wash with __________.  

12. To prepare a standard solution, you must use a __________ flask.  

13. The meniscus of water in a graduated cylinder is read at the __________.  

14. A mixture of oil and water can be separated by __________.  

15. Sodium hydroxide solution is prepared by dissolving NaOH in __________ water.  

16. The equivalence point in titration is when moles of acid __________ moles of base.  

17. Ammonium ions are tested using __________ reagent.  

18. Silver nitrate reacts with chloride ions to form a __________ precipitate.  

19. A systematic error in titration could be caused by an uncalibrated __________.  

20. The average titre is calculated by excluding __________ results.  

21. Goggles are optional during heating experiments.  

True/False

22.  Tap water can be used to prepare a standard solution.  

        True/False

23. A burette is rinsed with the titrant before use.

        True/False

24.  Crystallization purifies substances by dissolving and cooling.  

True/False

25. Litmus paper turns blue in acidic solutions.  

True/False

26.  A volumetric pipette has graduations for variable volumes.  

True/False

27. : Filtration separates solids from liquids using filter paper.  

True/False

28.  The endpoint and equivalence point are always the same.  

True/False

29. Mercury thermometers are safe to dispose of in regular trash.  

True/False

30. A centrifuge separates mixtures based on solubility.  

True/False