Jamb Chemistry 2020 Past Questions and Answers

Question 1:

• JAMB 2020

The electronic configuration of an element is 1S${}^2$ 2S${}^2$ 2P${}^6$ 3S${}^2$ 3P${}^3$. How many unpaired electrons are there in the element?

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

Question 2:

• JAMB 2020

Which of the following can be obtained by fractional distillation?

A. Nitrogen from liquid air
B. Sodium Chloride from sea water
C. Iodine from solution of Iodine in carbon tetrachloride
D. Sulphur from the solution of sulphur in carbon disulphide

Question 3:

• JAMB 2020

Duralumin consists of aluminum, copper?

A. Zinc and Gold
B. Lead and Manganese
C. Nickel and Silver
D. Manganese and Magnesium

Question 4:

• JAMB 2020

An example of a polysaccharide is?

A. Dextrose
B. Mannose
C. Glucose
D. Starch

Question 5:

• JAMB 2020

8g of CH${}_4$ occupies 11.2 at S.T.P. What volume would 22g of CH${}_3$CH${}_2$CH${}_3$ occupy under the same condition?

A. 3.7dm${}^3$
B. 11.2dm${}^3$
C. 22.4dm${}^3$
D. 33dm${}^3$