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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 6:

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

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

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Question 7:

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

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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

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Question 8:

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

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

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Question 9:

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

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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

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Question 10:

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

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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

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