Jamb Chemistry Past Questions and Answers

Question 2126:

• JAMB 2019

When the end alkyl groups of ethyl ethanoate are interchanged, the compound formed is

A. Propylmethanoate
B. Ethylpropanoate
C. Methyl ethanoate
D. Methyl propanoate

Question 2127:

• JAMB 2019

The part of the total energy of a system that accounts for the useful work done in a system is known as

A. Enthalpy change
B. None of the above
C. Gibb's free energy
D. Entropy

Question 2128:

• 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 2129:

• 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 2130:

• JAMB 2020

Duralumin consists of aluminum, copper?

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