Chemistry 1984 Jamb Past Questions and Answers

Question 6 :

• JAMB 1984

Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?

A. 1 and 2
B. 2 and 3
C. 3 and 4
D. 1, 2, and 3
E. 2, 3, and 5

Question 7 :

• JAMB 1984

Naphthalene when heated melts at 354 K (81 ^oC). At this temperature the molecules of naphthalene

A. Decompose into smaller molecules
B. Change their shape
C. Are oxidized by atmospheric oxygen
D. Contract
E. Become mobile as the inter molecular forces are broken

Question 8 :

• JAMB 1984

The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is

A. 2:1
B. 1:1
C. 1:2
D. 1:4
E. 1:8

Question 9 :

• JAMB 1984

The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is

A. H₂SO₄ + Al(OH)₂ \(\to\) 2H₂O + AlSO₄
B. 3H₂SO₄ + 2Al(OH)₃ \(\to\) 6H₂O + Al₂(SO₄)₃
C. 3H₂SO₄ + 2AlH \(\to\) 6H₂O + Al(SO₄)₃
D. 3H₂ SO₄ + 2Al(OH)₃ \(\to\) Al(SO₄)₃
E. H₂SO₄ + Al(OH)₃ \(\to\) H₂O + Al₂(SO₄)₃

Question 10 :

• JAMB 1984

Which of the following mixtures would result in a solution of pH greater than 7?

A. 25.00 cm³ of 0.05 M H₂SO₄ and 25.00cm³ of 0.50 M Na₂CO₃
B. 25.00 cm³ of 0.05 M H₂SO₄ and 25.00 cm³ of 0.10 M NaHCO₃
C. 25.00 cm³ of 0.11 MH₂SO₄ and 25.00cm³ 0. 10 M NaOH
D. 25.00cm³ of 0.11 MH₂ SO₄ and 50.00 cm³ of 0.05 M NaOH
E. 25.00cm³ of 0.25 M H₂SO₄ and 50.00cm³ of 0.20 M NaOH