Jamb Chemistry 2021 Past Questions and Answers

Question 31:

• JAMB 2021

A 'breath test' used by traffic police to check drunken driving uses?

A. Tumeric on filter paper
B. Silica gel coated with saliva nitrate
C. Potassium permanganate-sulphuric acid
D. Potassium dichromatic-sulphuric acid

Question 32:

• JAMB 2021

Which one of the following is not a mixture?

A. Air
B. Mercury
C. Milk
D. Cement

Question 33:

• JAMB 2021

Which of the following is a non-metal that remains liquid at room temperature?

A. Chlorine
B. Phosphorus
C. Bromine
D. Helium

Question 34:

• JAMB 2021

Which of the following are chemical changes?
I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up

A. I and II
B. I, II, and III
C. III and IV
D. All of the above

Question 35:

• JAMB 2021

The atomic weight of nitrogen is?

A. 10
B. 12
C. 14
D. 16