Waec Chemistry 1994 Past Questions and Answers

Question 26:

• WAEC 1994

Which of the following reactions is accompanied by the first ionization energy of an element X?

A. X ⁺_(aq) → X ²⁺_(aq) + e-
B. X ^-_(g) → X_(g) + ^e-
C. X⁺_(g) → X²⁺ +^e-
D. X _(g) → X⁺_(g) +^e-
E. X_(s) → X ⁺_(g) + ^e-

Question 27:

• WAEC 1994

What is the molar of hydrogen sulphide gas in the reaction H₂SO_4(aq) + 3H₂S_(g) → 4S_(s) + 4H₂O _(l)n represented by the following equation?

A. Reducing agent
B. A bleaching agent
C. A dehydrating agent
D. A sulphonating agent
E. An oxidizing agent

Question 28:

• WAEC 1994

Alkanols have unexpectedly high boiling points relative to their molar masses because of intermolecular

A. Hydrogen bonding
B. Metallic bonding
C. Covalent bonding
D. Ionic bonding
E. Van der Waals' forces

Question 29:

• WAEC 1994

Sodium chloride is used in the following processes except in the

A. Treatment of polluted water
B. Preservation of food
C. Separation of soap from glycerol
D. Manufacture of chlorine
E. Manufacture of caustic soda

Question 30:

• WAEC 1994

The gaseous product formed when ammonia is passed over heated copper (ll) oxide is

A. Oxygen
B. Nitrogen
C. Hydrogen
D. Nitrogen (l) oxide
E. Nitrogen (ll) oxide