Jamb Chemistry Past Questions and Answers

Question 196:

• JAMB 1980

The IUPAC name for the compound is

A. 2,3-dimethylpent-2,3-ene
B. 2, 3- dimethylpent-2-ene
C. 3, 4-dimethylpent-3-ene
D. 3,4-dimethylpentene
E. 3,4-dimethlhept-2-ene

Question 197:

• JAMB 1980

Which of the following compounds will take up the molecules of bromine?

A. L
B. Ll
C. Lll
D. L and ll
E. L and lll

Question 198:

• JAMB 1980

Which of the following is the correct order in the above diagram increasing boiling point, of the isomeric \(C_{5}H_{12}\) compounds?

A. A
B. B
C. C
D. D
E. E

Question 199:

• JAMB 1980

The following graph demonstrates the rate of reaction between calcium carbonate (marble)and dilute hydrochloric acid. The graph shows that the rate of reaction is initially greatest when

A. The initial slope of the curve is steepest and this occur when small pieces of marble are used and is due to a small surface area of reactant
B. The occur when large pieces of marble are used and is due to a small surface area of reactant
C. The initial slope of the curve is steepest and this occurs when small pieces of marble are used and is due to a large surface area of reactant
D. The initial slope of the curve is steepest and this occur when large surface area of reactant
E. The initial slope of the curve is least steep and this occur when small pieces of marble are used and is due to the increased surface area of the reactant

Question 200:

• JAMB 1980

Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?

A. The bulb lights and copper is deposited at both electrodes
B. The bulb lights and copper is deposited at the anode and disappears from the cathode
C. The bulb lights and copper is deposited at the cathode and oxygen liberated at the anode
D. The bulb lights and copper is deposited at the cathode and disappears from the anode
E. The bulb lights but no additional changes are observed