Waec Chemistry 2021 Past Questions and Answers

Question 11:

• WAEC 2021

Consider the structure below

How many carbon atoms does the parent chain contain?

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

Question 12:

• WAEC 2021

Under which conditions of pressure (p) and temperature (T) would the volume of an inflated ballon increase? When

A. P and T are increased
B. Both T and P are decreased
C. T is increased and P is decreased
D. T is decreased and P is increased

Question 13:

• WAEC 2021

The collision between ideal gas molecules are considered to be perfectly elastic because

A. They collide without losing energy
B. They move randomly in a straight line
C. Their average kinetic energy is variable
D. The distance between them is large compared to their size

Question 14:

• WAEC 2021

Elements with high ionization energies would ____________

A. Lose electrons easily
B. Have large atomic radii
C. Have high effective nuclear charges
D. Have low atomic numbers

Question 15:

• WAEC 2021

Which of the following statements about Group VII elements is correct?

A. They are present in the same physical state
B. They are strong reducing agents
C. Their reactivity decreases down the group
D. They exist as monoatomic molecules