Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 2019

Which of the following gases may not be dried with concentrated sulphuric acid?

A. HCl
B. N2
C. Cl2
D. SO2
E. NH3

Question 2:

• JAMB 1979

Starch can be converted to ethyl alcohol by

A. Distillation
B. Fermentation
C. Isomerization
D. Cracking
E. Cooking

Question 3:

• JAMB 1979

On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?

A. SO₂ (g) + FeS (s)
B. SO₃ (g) +FeS(s)
C. SO₂ (g) + SO₃(g)
D. SO₂ (g) + H₂S (g)
E. SO₃(g) + H₂S(g)

Question 4:

• JAMB 1979

Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?

A. CaCO ₃
B. Zn(NO₃)₂
C. CuSO₄
D. AICI₃
E. CaSO₄

Question 5:

• JAMB 1979

A piece of metal (M) is dissolved in nitric acid and the resulting solution is treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which redissolves on the addition of excess alkali. The precipitate (B)when ignited in a crucible produces the oxide of the metal(m). The METAL M is

A. Zn
B. Cu
C. Al
D. Au
E. Ca