JAMB Chemistry Past Questions & Answers - Page 164

816.

Three liquids X, Y and Z containing only hydrogen and carbon were burnt on a spoon. X and Y burnt with sooty flames while Z did not. Y is able to discharge the colour of bromine water whereas X and Z cannot. Which of the liquids would be aromatic in nature?

A.

X and Z

B.

Y

C.

X

D.

Z

Correct answer is C

Aromatic compounds burn with a yellow sooty flame and they don't decolorise bromine water, since bromine is not electrophilic enough except in the presence of a strong Lewis catalyst.

817.

The gas responsible for most of the fatal explosions in coal mines is

A.

butane

B.

ethene

C.

ethane

D.

methane

Correct answer is D

No explanation has been provided for this answer.

818.

The alkaline hydrolysis of fats and oils produces soap and

A.

propane 1, 1, 3 - triol

B.

propane - 1,2,3 - triol

C.

propane - 1,3,3 - triol

D.

propane - 1, 2, 2 - triol

Correct answer is B

No explanation has been provided for this answer.

819.

The bond which joins two ethanoic acid molecules in the liquid state is

A.

a covalent bond

B.

an ionic bond

C.

a dative covalent bond

D.

a hydrogen bond

Correct answer is D

No explanation has been provided for this answer.

820.

The reaction between ethanoic acid and sodium hydroxide is an example of

A.

esterification

B.

neutralization

C.

hydroxylation

D.

hydrolysis

Correct answer is B

No explanation has been provided for this answer.