Jamb Chemistry 1979 Past Questions and Answers

Question 41:

• 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 42:

• JAMB 1979

One of the following techniques can be used to show that chlorophyll pigment is a mixture of chemical compounds and not a single coloured compound

A. Cystallization
B. Hydrolysis
C. Sublimation
D. Filtration
E. Chromatography

Question 43:

• JAMB 1979

A gas occupies 30.0 dm³ at S.T.P. What volume would it occupy at 91^oC and 380 mm Hg?

A. 20. 0dm³
B. 40.0dm³
C. 60. 0dm³
D. 80. 0dm³
E. 100. 0dm³

Question 44:

• JAMB 1979

When excess ethanol is heated to 145 ^oC in the presence of concentrated sulphuric acid, the product is

A. Diethyl ether
B. Ethyne
C. Diethyl sulphate
D. Acetone
E. Ethanoic acid

Question 45:

• 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