16. The apparatus used in preparing a standard solution is a
A: Burette
B: Measuring cylinder
C: Pipette
D: Volumetric flask

17. During an oxidation reaction, an oxidizing agent
A: Gains oxygen
B: Loses oxygen
C: Loses hydrogen
D: Loses electrons

18. Calculate the quantity of electricity in coulombs if a current of 0.5A is passed through an electrolyte for 15 minutes.
A: 450
B: 45
C: 7.5
D: 27000

19. The number of replaceable hydrogen atoms in a molecule of an acid is called its
A: Acidity
B: Alkalinity
C: Basicity
D: pH value

20. The substance left in the glass tube when excess dry hydrogen is passed over heated copper (II) oxide is:
A: Copper(I)oxide
B: Water
C: Oxygen
D: Metallic copper

21. The function of limestone in the extraction iron is to remove
A: Excess air
B: Earthy impurities
C: Unburnt coke
D: Molten iron

Questions 22 and 23

Instructions: Each question is followed by four responses numbered 1 -4. One or more of these responses is (are) correct. Decide which response(s) (are) correct then choose
A: If only 1 , 2 and 3 are correct
B: If only I and 3 are correct
C: If on ly 2 and 4 are correct
D: If only 4 is correct

22. The factors that influence the preferential discharge of ions during electrolysis are
1. Position of ion on the electrochemical series.
2. Nature of the electrode.
3. Concentration of the ion.
4. the charge on the ion.

23. A catalyst is a substance which
1. Increases the temperature of a reaction
2. Increases the rate of a chemical reaction
3. Increases the yield of a chemical reaction
4. Remains chemically unchanged at the end of a reaction

24. The components of crude oil can be separated by
A: Reforming
B: Cracking
C: Simple distillation
D: Fractional distillation

25. The empirical formula of an organic compound is CH. If the relative molecular mass of the compound is 78, then the molecular formula is:
A: C₂H₂
B: C₆H₆
C: C₄H₄
D: C₆H₁₂

26. Carbon dioxide is prepared in the laboratory by the action of dilute hydrochloric acid on marble chips. Dilute sulphuric acid is not suitable for this process because;
A: An insoluble coat of calcium sulphate will be formed causing the reaction to stop.
B: The reaction will be too fast.
C: The reaction will be too slow.
D: Marble chips do not react with dilute sulphuric acid.

27. Select a carbonate that will NOT decompose when strongly heated in an open crucible.
A: CaC0₃
B: C₁₁CO₃
C: Na₂C0₃
D: MgC0₃

Questions 28-30 concern the following substances
A: Ammonia gas
B: Lemon juice
C: Water
D: Ethanol
Each letter can be used once, more than once or not at all. Select from A to D a substance

28. Which produces steamy fumes with PCI_5.

29. That will turn moist red litmus paper blue.

30. That will turn blue litmus paper red.