Waec Chemistry 1997 Past Questions and Answers

Question 1:

• WAEC 1997

The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as

A. Tyndal effect
B. Diffusion
C. Osmosis
D. Brownian movement
E. Dialysis

Question 2:

• WAEC 1997

The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as

A. Tyndal effect
B. Diffusion
C. Osmosis
D. Brownian movement
E. Dialysis

Question 3:

• WAEC 1997

The mass number of an element is the sum of its

A. Electrons, neutrons and protons
B. Electrons and protons
C. Protons and neutrons
D. Orbital electrons
E. Valence electrons

Question 4:

• WAEC 1997

How many unpaired electrons are there in an atom of an element with the following electronic configuration? 1s²2s²2p₆


A. O
B. 1
C. 2
D. 6
E. 8

Question 5:

• WAEC 1997

Radon is used as a tracer in medical research because it

A. Is monatomic
B. Is radioactive
C. Is a noble gas
D. Has a complete valence shell
E. Has a low boiling point