Post Utme University of Calabar Chemistry Past Questions and Answers

Question 11:

Alkanoates are produced from alkanols by ____________

A. Esterification
B. Fermentation
C. Saponification
D. Oxidation

Question 12:

Esters are employed in the following except ____________

A. Making perfumes
B. Nail vanishe
C. Making solvent for cellulose trioxonitrate(V)
D. Making cement

Question 13:

What mass of anhydrous sodium trioxocarbonate(IV) is present in \(500 cm ^{2}\) of \(0.1 mol dm m ^{-2}\) of the solution \([ Na =23, C =12, O =16]\)

A. \(10.69\)
B. \(106 g\)
C. \(5.3 g\)
D. \(53 g\)

Question 14:

The oxidation state of oxygen in tetraoxosulphate(IV) acid is ____________

A. \(-4\)
B. \(+4\)
C. \(-2\)
D. \(+2\)

Question 15:

Metals of the first transition series have special properties which are different from those of groups I and II elements because they have partially filled ____________

A. S orbital
B. P orbital
C. D orbital
D. F orbital