Jamb Chemistry 1989 Past Questions and Answers

Question 1:

• JAMB 1989

Which of the following would support the conclusion that a solid sample is a mixture?

A. The solid can be ground to a fine powder
B. The density of the solid is 2.25 g dm³
C. The solid has a melting range of 300^oC to 375^oC
D. The solid absorbs moisture from the atmosphere

Question 2:

• JAMB 1989

Which of the following would support the conclusion that a solid sample is a mixture?

A. The solid can be ground to a fine powder
B. The density of the solid is 2.25 g dm³
C. The solid has a melting range of 300^oC to 375^oC
D. The solid absorbs moisture from the atmosphere

Question 3:

• JAMB 1989

The molar ratio of carbon to hydrogen of a volatile liquid compound is 1: 2. 0. 12 g of the liquid on evaporation at s.t.p. gave 32 cm³ of vapour. The molecular formula of the liquid is
[G.M.V =22.4 dm ³, C = 12, H = 1]

A. C ₃ H ₆
B. C ₄H ₈
C. C ₅C ₁₀
D. C ₆H ₁₂

Question 4:

• JAMB 1989

20.00 cm ³ of a solution containing 0.53 g of anhydrous Na₂CO₃ in 100 cm³ requires 25.00 cm³ of H₂SO₄ for complete neutralisation. The concentration of the acid solution in moles per dm is [H =1, C = 12, O = 16, Na =23, S = 32]

A. 0.02
B. 0.04
C. 0.06
D. 0.08

Question 5:

• JAMB 1989

The minimum volume of oxygen required for the complete combustion of a mixture of 10cm ³ of CO and 15 cm ³ of H ² is

A. 25.0cm³
B. 12.5 cm³
C. 10.0 cm³
D. 5.0cm³