Waec Chemistry Past Questions and Answers

Question 16:

• 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 17:

• WAEC 1988

Which of the following is used as an anaesthetic?

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

Question 18:

• 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 19:

• 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

Question 20:

• WAEC 1988

Which of the following statements is not correct?

A. Carbon exhibits allotropy
B. Sulphur exhibits allotropy
C. Chlorine exhibits allotopy
D. Nitrogen is a gas
E. Argon is a noble gas