Atomic structure and bonding - Jamb Chemistry Past Questions and Answers

Question 16:

• JAMB 1979

Helium atoms are chemically unreactive because

A. There are no electrons around the nucleus
B. The number of protons equals the number of electrons
C. There are equal number of protons and neutrons in the nucleus
D. The outer electron shell is completely filled
E. The atoms contain only protons

Question 17:

• JAMB 1979

Indicate which of the following statements is not true as we move from left to right along the periodic Table:

A. Atomic number of elements increases
B. Atomic mass of elements increases
C. Electropositive character of elements increases
D. Electronegative character of elements increases
E. Number of electrons in the outermost orbits of element increases

Question 18:

• JAMB 1980

Chlorine, bromine and iodine resemble each other in that all?

A. Dissolve in alkalis
B. React violently with hydrogen without heating
C. Displace each other from solutions of their salts
D. Are gases
E. Are liquids

Question 19:

• JAMB 1980

Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?

A. When exposed to air, it slowy changes to liquid
B. Its solution in water conducts electricity
C. Its solution in water, on evaporationm gives a white solid
D. Its solution in water liberates hydroge when in contact with aluminium metal
E. Its oxide, when stronlgy heated, regenerates the elements X

Question 20:

• JAMB 1980

Which of the following compounds will take up the molecules of bromine?

A. L
B. Ll
C. Lll
D. L and ll
E. L and lll