Chemistry 1983 Jamb Past Questions and Answers

Question 16 :

• JAMB 1983

In which of the following processes is iron being oxidized?
1 Fe + H₂SO₄ → FeSO₄ +H₂
2 FeSO₄ + H₂S → FeS + H₂SO₄
3 2FeCI₂ + Cl₂ → 2FeCl₃
4 2FeCl₃ + SnCl₂ + → 2FeCl₂ + SnCl₄

A. 1 only
B. 2 only
C. 3 only
D. 1 and 3
E. 2 and 4

Question 17 :

• JAMB 1983

In the reaction Fe + Cu²⁺ \(\to\) Fe²⁺ + Cu,iron displaces copper ions to from copper. This is due to the fact that

A. Irn is in the metallic from while the copper is in the ionic from
B. The atomic weight of copper is greater than that of iron
C. Copper is greater than iron
D. Copper metal has more electrons than iron metal
E. Iron is higher in the electrochemical series than copper

Question 18 :

• JAMB 1983

C₂H₅ - C = CH₂
CH₃
The correct name of the compound with the above structural formula is

A. 2-methylbut -1-ene
B. 2-methylbut -2-ene
C. 2-methylbutane
D. 2-ethylprop-1 -ene
E. 2-ethylprop-2-ene

Question 19 :

• JAMB 1983

How many isomeric forms are there for the molecular formula C₃H₆Br₂?

A. 1
B. 2
C. 3
D. 4
E. 5

Question 20 :

• JAMB 1983

A piece of burning sulphur will continue to burn in a gas jar of oxygen to give misty fumes which readily dissolved in water. The resulting liquid is

A. Sulphur (VI) trioxide
B. Tetraoxosulphate (VI) acid
C. Trioxosulphate (IV) acid
D. Dioxosulphate (II) acid
E. Hydrogen sulphide