Waec Chemistry 1994 Past Questions and Answers

Question 11:

• WAEC 1994

Tetraoxosulphate (lV) acid is described as strong acid because it is highly

A. Corrosive
B. Concentrated
C. Reactive
D. Soluble in water
E. Ionized in water

Question 12:

• WAEC 1994

The following will decolourize acidified potassium tetraoxomanganate (VII) solution except

A. Sulphur (lV) oxide
B. But-3-ene
C. Pentane
D. Hydrogen sulphide
E. Propyne

Question 13:

• WAEC 1994

Polyatomicity is illustrated by molecules of

A. Sulphur
B. Carbon (IV) oxide
C. Noble gases
D. Liquefied oxygen
E. Liquefied nitrogen

Question 14:

• WAEC 1994

Calcium is usually extracted by the electrolysis of its

A. Trioxonitrate (V)
B. Tetraoxosulphate (IV)
C. Oxide
D. Hydride
E. Chloride

Question 15:

• WAEC 1994

When naphthalene on heating changes from the solid state directly to the gaseous state it undergoes

A. Evaporation
B. Sublimation
C. Decomposition
D. Combustion
E. Ionisation