Jamb Chemistry Past Questions For Year 1981

Question 1

Which of the following represents a precipitation reaction?

jamb 1981

• A. H₂SO₄ + NaCl \(\to\) NaHSO₄ + HCl
• B. Fe +H₂SO₄ \(\to\) FeSO₄ + H₂
• C. 4HCl + MnO₂ \(\to\) MnCl₂ + 2H₂O + Cl₂
• D. Na₂SO₄ + pb(NO₃) \(\to\) PbSO₄ + 2NaNO
• E. CuO +2HCl \(\to\) Cl₂ + H₂O

Question 2

When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?

jamb 1981

• A. hydrogen
• B. carbon monoxide
• C. carbon dioxide
• D. sulphur oxide
• E. chlorine

Question 3

An element X has 127 neutrons and 82 electrons.

Its atomic number is?

jamb 1981

• A. 209
• B. 105
• C. 45
• D. 82

Question 4

For iron to rust, there should be present?

jamb 1981

• A. oxygen
• B. moisture
• C. carbondioxide
• D. oxygen and moisture
• E. oxygen, moisture and carbondioxide

Question 5

Methane is member of the homologous series called?

jamb 1981

• A. alkenes
• B. alcohols
• C. esters
• D. alkanes
• E. alkynes