JAMB Chemistry Past Questions & Answers - Page 157

781.

A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless gas which turns clear limewater milky. The sea shell contains

A.

sodium chloride

B.

ammonium nitrate

C.

calcium carbonate

D.

calcium chloride

E.

magnesium chloride

Correct answer is C

No explanation has been provided for this answer.

782.

The function of conc. H2SO4 in the esterification of ethanoic acid with ethanol is to

A.

serve as a dehydrating agent

B.

serve as a solvent

C.

act as a catalyst

D.

prevent any side reaction

E.

serve as an oxidizing agent

Correct answer is C

No explanation has been provided for this answer.

783.

If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bring sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone

A.

a polymerization reaction

B.

an isomerization reaction

C.

an addition reaction

D.

a substitution reaction

E.

a reduction reaction

Correct answer is D

No explanation has been provided for this answer.

784.

Alkanes

A.

are all gases

B.

have the general formula CnH2n + 2O

C.

contain only carbon and hydrogen

D.

are usually soluble in water

E.

are usually active compounds

Correct answer is C

No explanation has been provided for this answer.

785.

Sodium hydroxide (NaOH) pellets are

A.

deliquescent

B.

hygroscopic

C.

efflorescent

D.

hydrated

E.

fluorescent

Correct answer is A

No explanation has been provided for this answer.