Jamb Chemistry 1997 Past Questions and Answers

Question 31:

• JAMB 1997

2X_(aq) + MnO_2(s) + 4H⁺_(aq) → X_2(g) + Mn²⁺_(aq) + 2H₂O.
The reaction above can be used for the laboratory preparation of all halogens except fluorine because it is?

A. A poisionous gas
B. An oxidizing agent
C. Electronegative in nature
D. Highly reactive

Question 32:

• 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 33:

• JAMB 1997

Which of the additives could improve the quality of steel?

A. Silicon
B. Sulphur and phosphorus
C. Carbon
D. Chromium and nickel

Question 34:

• 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 35:

• JAMB 1997

A sample of a substance containing only C and H burns in excess O₂ to yield 4.4g of CO₂
and 2.7 g of H₂O. The empirical formula of a substance is?
(C = 12, O = 16, H = 1)

A. CH₃
B. CH₂
C. CH₄
D. C₂H₂₄