Sugar is separated from its impurities by

• A. precipitation
• B. crystallization
• C. distillation
• D. evaporation

Which of the following substances is a mixture?

• A. Sulphur powder
• B. Bronze
• C. Distilled water
• D. Ethanol

The best form of government for a heterogeneous society is a

• A. quasi-federal system
• B. federal system
• C. confederal system
• D. unitary system

The LORD sent Samuel to Saul to go and destroy the Amalekites because

• A. they opposed Israel on their way out of Egypt
• B. they were idolaters
• C. they disobeyed God
• D. their land had been given to Israel after the battle

(a) State five functions of a chamber of commerce.

(b) Explain five functions of a trade association.

What does a linker program do?

• A. it places the program in the memory for execution
• B. relocates the program to execute from the specific memory area allocated to it
• C. Links the program with other programs needed for its execution
• D. interface the program with the entities generating its input data

(a) Explain why it is not advisable to sterilize a clinical thermometer in boiling water at normal atmospheric pressure.

(b) State the effect of an increase in pressure on the

(i) boiling point; and

(ii) melting point of water.

(c) Diagram:

The graph shown above is that of the saturated vapour pressure (s.v.p.) of water against temperature.

Pure water is known to boil at 100\(^o\)C and at an atmospheric pressure of 760 mmHg. What general conclusion can be drawn from the information given above?

d) A thread of mercury of length 20 cm is used to trap some air in a capillary tube with uniform cross-sectional area and closed at one end. With the tube vertical and the open end uppermost, the length of the trapped air column is 15cm. Calculate the length of the air column when the tube is held:

i) horizontally;

ii) vertically with the open end underneath. [Atmospheric pressure = 76cmHg]

Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?

• A. 16.0
• B. 16.2
• C. 17.0
• D. 18.0

The term Unicameralism means

• A. legislative assemblies
• B. parliamentary elections
• C. one-chamber parliament
• D. complete absence of parliament

A vapour is said to be saturated when

• A. more molecules return to the liquid than the amount that left it
• B. a dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at a given temperature
• C. the vapour pressure is equal to the atmospheric pressure
• D. all molecules are moving with the same speed in all directions at a given temperature