Waec Chemistry 1988 Past Questions and Answers

Question 11:

• WAEC 1988

A salt which loses mass when exposed to air is

A. Hygroscopic
B. Deliquescent
C. Efflorescent
D. Fluorescent
E. Effervescent

Question 12:

• WAEC 1988

Detergents are better than soaps for laundry because

A. Detergents are synthetic while soaps are not
B. Detergents are more soluble in water than soaps
C. Scum is precipitated when soaps are used with hard water but not with stergents
D. Soaps from soluble saits with ions causing hardness of water while detergents do not
E. Soaps are in bars while detergents are in powder form

Question 13:

• WAEC 1988

Which of the following is used as an anaesthetic?

A. CHI₃
B. CHCI₃
C. CH₃OH
D. C₂H₅OH
E. CHBr₃

Question 14:

• WAEC 1988

Which of the following types of hybridization gives rise to tetrahedral molecules?

A. Sp
B. Sp²
C. Sp₃
D. Sp³d
E. Sp³d²

Question 15:

• WAEC 1988

Which of the following is a neutral oxide?

A. Nitrogen (IV0 oxide
B. Carbon (IV) oxide
C. Sulphur (IV) oxide
D. Phodphoorus (IV) oxide
E. Nitrogen oxide