Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 86:

• JAMB 1997

The removal of rust from iron by treatment with tetraoxosulphate (IV) acid is based on the?

A. Hydrolysis of the iron
B. Reaction of acid with base
C. Oxidationof the rust
D. Dehydration of the iron

Question 87:

• JAMB 1997

Sodium hydroxide is prepared commercially from sodium chloride solution by?

A. Electrolysis using mercury as cathode
B. Hydrolysis in steam using a catalyst
C. Electrolysis using iron as anode
D. Treating sodium chloride with ammonia and carbon (IV) oxide

Question 88:

• JAMB 1997

An undesirable paraffin in the petroleum industry which is particularly prone to knocking is?

A. Iso-octane
B. N-heptane
C. Iso-heptane
D. N-octane

Question 89:

• JAMB 1997

Synthetic rubber obtained by the polymerization of chlorobutadiene in the presence of sodium is called?

A. Teflon
B. Isoprene
C. Polythene
D. Neoprene

Question 90:

• JAMB 1998

Excess phosphorus was burnt in a gas jar and the residual gas passed successively over concentrated KOH solution and concentration H₂SO₄ before being collected in a flask. The gases collected are?

A. Carbon (IV) oxide, nitrogen and the rare gases
B. Nitrogen and the rare gases
C. Carbon (IV) oxide, nitrogen (IV) oxide and the rare gases
D. Carbon (IV) oxide