Jamb Chemistry 1981 Past Questions and Answers

Question 6:

• JAMB 1981

The oxidation number of manganese in KMnO₄ is?

A. +1
B. +3
C. +5
D. +7
E. +2

Question 7:

• JAMB 1981

Methane is member of the homologous series called?

A. Alkenes
B. Alcohols
C. Esters
D. Alkanes
E. Alkynes

Question 8:

• JAMB 1981

For iron to rust, there should be present?

A. Oxygen
B. Moisture
C. Carbondioxide
D. Oxygen and moisture
E. Oxygen, moisture and carbondioxide

Question 9:

• JAMB 1981

The mass number of an atom is?

A. The number of electrons in the atom
B. The number of protons in the nucleus of the atom
C. The number of neutrons in the nucleus of the atom
D. The sum of numbers of electrons and protons inthe atom
E. The sum of numbers of proton and neutrons in the nucleus of the atom

Question 10:

• JAMB 1981

Sodium and potassium belong to the same group of the Periodic Table. This is because?

A. Both are metals
B. Both are soft and lighter than water
C. Both form cations by losing electrons
D. Both have identical electronic configuration
E. Both react with water vigorously