WAEC Past Questions and Answers - Page 1807

9,031.

When a crystal was added to its solution, it did not dissolve and the solution remained unchanged, showing that the solution was

A.

concentrated

B.

supersaturated

C.

unsaturated

D.

colloidal

E.

saturated

Correct answer is E

No explanation has been provided for this answer.

9,033.

In which of the following crystals are the particles held by van der Waal's forces only?

A.

Sodium chloride

B.

Ice

C.

Diamond

D.

Iodine

E.

Quartz

Correct answer is D

No explanation has been provided for this answer.

9,034.

Compounds that have the same molecular formula but different structures are said to be

A.

allotropic

B.

polymorphic

C.

polymeric

D.

isomeric

E.

isotopic

Correct answer is D

No explanation has been provided for this answer.

9,035.

Which of the following properties is not characteristic of electrovalent compounds?

A.

formation of crystalline solids

B.

solubility in polar solvents

C.

high vapour pressures

D.

high melting and boiling points

E.

ability to conduct electricity in aqueous solution

Correct answer is C

No explanation has been provided for this answer.