Atomic structure and bonding - Jamb Chemistry Past Questions and Answers

Question 81:

• JAMB 1997

In the periodic table, what is the property that decreases along the periodic and increases down the group?

A. Atomic number
B. Electron affinity
C. Ionization potential
D. Atomic radius

Question 82:

• JAMB 1997

Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the compound P_xQ_Y. The respective values of x and y are?

A. 1 and 1
B. 1 and 2
C. 2 and 1
D. 3 and 1

Question 83:

• JAMB 1997

Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?

A. 16.0
B. 16.2
C. 17.0
D. 18.0

Question 84:

• 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 85:

• JAMB 1998

Which of the following electron configurations indicates an atom with the highest ionization energy?

A. 2,8,7
B. 2,8,8,1
C. 2,8,8,2
D. 2,8,8,7