WAEC Past Questions and Answers - Page 1735

8,671.

Which of the following is a disaccharide?

A.

fructose

B.

starch

C.

cellulose

D.

sucrose

E.

glycogen

Correct answer is D

No explanation has been provided for this answer.

8,672.

When excess carbon (lV) oxide is passed into lime water, the turbidity produced initially disappears due to the formation of

A.

calcium oxide

B.

calcium carbide

C.

calcium hydrogentrioxocarbonate (IV)

D.

trioxocarbonate (IV) acid

E.

calcium trioxocarbonate (IV)

Correct answer is C

No explanation has been provided for this answer.

8,673.

What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne?

A.

1 mole

B.

2 moles

C.

3 moles

D.

5 moles

E.

6 moles

Correct answer is B

No explanation has been provided for this answer.

8,674.

When acidified KMnO4 solution is decolorised by ethene, the gas acts as

A.

a straight-chain hydrocarbon

B.

a saturated hydrocarbon

C.

a reducing agent

D.

a dehydrating agent

E.

an oxidizing agent

Correct answer is C

No explanation has been provided for this answer.

8,675.

On exposing palm wine to air for some days, it becomes sour owing to the conversion of

A.

glucose to ethanol

B.

glucose to gluconic acid

C.

ethanol to ethanoic acid

D.

ethanol to ethanal

E.

palm wine to palmitic acid

Correct answer is C

No explanation has been provided for this answer.