WAEC Chemistry Past Questions, Answers, And Explanations - Chemistry

Waec Chemistry Questions

Question 301:

WAEC 1994

Which of the following is not a property of magnesium oxide?

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A High melting point
B Dissolution in polar solvents
C Presence of ionic bonds
D Possession of crystal lattice
E Low binding energy

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Question 302:

WAEC 1994

Which of the following would increase the rate of reaction of chips of a metal M as shown in the equation below? M_(s) + 2HCI_(aq) â†’ MCI_2(aq) + H_2(g)

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A Diluting the hydrochloric acid
B Adding some distilled water
C Decreasing the temperature
D Grinding the metal into powder
E Increasing the pressure

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Question 303:

WAEC 1994

The oxidation number of phosphorus in PO 3/4 is

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A + 1
B +2
C +3
D +4
E +5

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Question 304:

WAEC 1994

The number of atoms in 1.2g of carbon - 12 isotope is

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A 1.00 x 10 ₂₂
B 6.02 x 10₂₂
C 1.20 x 10 ₂₃
D 1.00 x 10₂₃
E 6.02 x 10₂₄

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Question 305:

WAEC 1994

Tetraoxosulphate (lV) acid is described as strong acid because it is highly

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A Corrosive
B Concentrated
C Reactive
D Soluble in water
E Ionized in water

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