Waec Chemistry 1992 Past Questions and Answers

Question 11:

• WAEC 1992

The halide used widely in photography is

A. Ammonium chloride
B. Calcum chloride
C. Silver bromide
D. Sodium brmide
E. Aluminium fluroide

Question 12:

• WAEC 1992

The scum formed when soap is mixed with hard water could be

A. Calcium trioxocarbonate (IV)
B. Propane- 1, 2, 3 - triol
C. Calcium hydrogentrioxocarbonate (IV)
D. Magnesium tetraoxosulphate (IV)
E. Calcium stearate

Question 13:

• WAEC 1992

What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 mins? (1F = 96500C)

A. 0. 11F
B. 0.12F
C. 0.22F
D. 1.1F
E. 2.2F

Question 14:

• WAEC 1992

''The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants''. This statement is associated with the

A. Kinetic theory
B. Rate law
C. Atomic theory
D. Collision theory
E. Gas laws

Question 15:

• WAEC 1992

What is the following compounds will not decompose when heated strongly ?

A. NaHCO₃
B. K₂CO₃
C. MgCO₃
D. Ca(HCO₃)₂
E. ZnCO₃