Jamb Chemistry 1990 Past Questions and Answers

Question 21:

• JAMB 1990

A cycloalkane with the molecular formula C₅H₁₀ has ?

A. One isomer
B. Two isomers
C. Three isomers
D. Four isomers

Question 22:

• JAMB 1990

The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?

A. Alkanoate
B. Alkaene
C. Alkanol
D. Alkane

Question 23:

• JAMB 1990

Alkaonic acids have low volatility compared with alkanols because they?

A. Are more polar than alkaonls
B. Have two oxygen atoms while alkanols have one
C. Form hydrogen bonds while alkanols do not
D. Form two hydrogen bonds while alkanols form one

Question 24:

• JAMB 1990

The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4- trimethly pentane and 45 g of n-heptane is ?

A. 45
B. 55
C. 80
D. 100

Question 25:

• JAMB 1990

Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?

A. Carbon (IV) oxide
B. Coal tar
C. Charcoal
D. Toxic fumes