Jamb Chemistry 1982 Past Questions and Answers

Question 16:

• JAMB 1982

When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?

A. H₂S
B. Ag₂S
C. PbS
D. HNO₃
E. S

Question 17:

• JAMB 1982

The production of ammonia by the haber process may be represented by the equilibrium equation N₂(g) + 3H₂(g) ↔ 2NH₃ ∆H = -22KJ. Therefore the production of ammonia will be favoured by?

A. Only high pressure
B. Only high temperature
C. A combination of high temperature and low pressure
D. A combination of low temperature and high pressure
E. Low pressure

Question 18:

• JAMB 1982

Which of the following represents ethyl ethanonate?

A. CH₃CH₂CO₂CH₃
B. (CH₃CO₂)₂O
C. CH₃CH₂CO₂CH₂CH₃
D. CH₃CO₂CH₂CH₃
E. CH₃CH₂COCH₂CH₃

Question 19:

• JAMB 1982

Which of the following equations represents an oxidizing action of sulphur dioxide?

A. SO₂ + 2HNO₂ → H₂SO₄ + 2NO₂ + heat
B. 2SO₂ + 2H₂O + O₂ → 2H₂SO₄
C. SO₂ + 2H₂O + CI₂ → H₂SO₄ + 2HCI
D. SO₂ + 2H₂S → 3S + 2H₂O
E. K₂Cr₂O₇ + H₂SO₄ + 3SO₂ → K₂SO₄ + Cr₂(SO₄)₃ + H₂O

Question 20:

• JAMB 1982

If the rate of diffusion of oxygen gas is taken as 1, what will be rated of diffusion of methane whose relative molar mass is 16?

A. 2.0
B. 1.8
C. 1.4
D. 1.0
E. 0.5