Waec Chemistry Past Questions
Question 11
Which of the following types of hybridization gives rise to tetrahedral molecules?
- A. sp
- B. sp2
- C. sp3
- D. sp3d
- E. sp3d2
Question 12
Which of the following is used as an anaesthetic?
- A. CHI3
- B. CHCI3
- C. CH3OH
- D. C2H5OH
- E. CHBr3
Question 13
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 14
A salt which loses mass when exposed to air is
- A. hygroscopic
- B. deliquescent
- C. efflorescent
- D. fluorescent
- E. effervescent
Question 15
What quantity of silver is deposited when 96500C of electricity is passed through a solution containing silver ions? (Ag = 108, 1F = 96500C)
- A. 1.08g
- B. 40g
- C. 10,.8g
- D. 21.6g
- E. 108g
