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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 16:

Detergents are better than soaps for laundry because

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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

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Question 17:

Which of the following is used as an anaesthetic?

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A CHI₃
B CHCI₃
C CH₃OH
D C₂H₅OH
E CHBr₃

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Question 18:

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

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A Sp
B Sp²
C Sp₃
D Sp³d
E Sp³d²

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Question 19:

Which of the following is a neutral oxide?

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

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Question 20:

Which of the following statements is not correct?

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

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