Chemistry 2012 Jamb Past Questions and Answers

Question 11 :

• JAMB 2012

Group VII elements are

A. Monoatmic
B. Good oxidizing agents
C. Highly electropositive
D. Electron donors

Question 12 :

• JAMB 2012

Which of the following is used to study the arrangement of particles in crystal lattices?

A. Alpha-particles
B. Beta-particles
C. Gamma-rays
D. X-rays

Question 13 :

• JAMB 2012

I. It has a varied composition from one place to another. ll. it constituents can be separated by physical means
lll. It contains unreactive noble gases
which of the above shows that air is a mixture?

A. I and ll only
B. Ll and lll only
C. L and lll only
D. L,lll and lll

Question 14 :

• JAMB 2012

The chemicals used to soften hard water involves the addition of

A. Insoluble sodium compounds which from soluble solutions of calcium and magesium
B. Solube soudium compounds which from soluble solutions of calcium and magnesium ions
C. Solube sodium compounds which from insoluble precipitates of calcium and magnesium ions
D. Insoluble precipitates of calcium and magnesium ions

Question 15 :

• JAMB 2012

Chlorination of water for town supply is carried out to

A. Make the water colourless
B. Remove germs from the water
C. Make the water tastedful
D. Remove odour from the water