Jamb Chemistry 1998 Past Questions and Answers

Question 1:

• JAMB 1998

The addition of water to calcium oxide leads to?

A. A physical change
B. A chemical change
C. The formation of a mixture
D. An endothermic change

Question 2:

• JAMB 1998

The addition of water to calcium oxide leads to?

A. A physical change
B. A chemical change
C. The formation of a mixture
D. An endothermic change

Question 3:

• JAMB 1998

A mixture of iron and sulphur can be separated by dissolving the mixture in?

A. Steam
B. Dilute hydrochloric acid
C. Dilute sodium hydroxide
D. Benzene

Question 4:

• JAMB 1998

A given amount of gas occupies 10.0 dm³ at atm, and 273°C. The number of moles of the gas present is?
(Molar volume of a gas at s.t.p. = 22.4 dm³)

A. 0.89 mol
B. 1.90 mol
C. 3.80 mol
D. 5.70 mol

Question 5:

• JAMB 1998

8.0 g of an element X react with an excess of copper (ll) tetraoxosulphate (lV) solution to deposit 21.3 g of copper. The correct equation for the reaction is?
(Cu = 64).

A. X_(s) + CuSO_4(aq) → Cu_(s) + XSO_4(aq)
B. X_(s) + 2CuSO_4(aq) → 2Cu_(s) + X(SO₄)_2(aq)
C. 2X_(s) + CuSO_4(aq) → Cu_(s) + X₂SO_4(aq)
D. 2X_(s) + 3CuSO_4(aq) → 3Cu_(s) + X₂(SO₄)_3(aq)