Chemistry 1997 Waec Past Questions and Answers

Question 6 :

• WAEC 1997

What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?

A. Group 0
B. Group 1
C. Group 4
D. Group 6
E. Group 7

Question 7 :

• WAEC 1997

In linear molecules, the bond angle is

A. 90^o
B. 140^o
C. 109^o
D. 120^o
E. 180^o

Question 8 :

• WAEC 1997

A sodium atom and a sodium ion have the same

A. Number of neutrons
B. Number of electrons
C. Electric charge
D. Electronic structure
E. Chemical properties

Question 9 :

• WAEC 1997

If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is

A. X₃N
B. XN₃
C. X₃N₂
D. N₂X
E. NX₂

Question 10 :

• WAEC 1997

An increase in the pressure of a gas results in a decrease in its

A. Mass
B. Vapour density
C. Volume
D. Temperature
E. Concentration