WAEC Past Questions and Answers - Page 1405

7,021.

A substance is said to be hygroscopic if it absorbs

A.

water from the atmosphere to form a solution

B.

heat from the surrounding

C.

carbon (IV) oxide from the atmosphere

D.

moisture from the atmosphere without dissolving

Correct answer is D

No explanation has been provided for this answer.

7,022.

The risk of production in agricultural business is borne by the

A.

Farm owner

B.

Farm labour

C.

Farm assistant

D.

Farmer's family

Correct answer is A

Farm owner is the one who bears the risk of production in agricultural business, as they have the ultimate responsibility for the business's success or failure and make critical decisions that impact the farm's performance and profitability.

7,023.

Which of following acids forms normal salts only?

A.

Tetraoxosulphate (VI) acid

B.

Trioxosulphate (IV) acid

C.

Acetic acid

D.

Tetraoxophosphate (V) acid

Correct answer is C

So we can determine that the basicity of Acetic acid is 1 because it releases one hydrogen ion in an aqueous solution.

Due to this they act as very weak acids. When weak acid reacts with strong base, they tend to form normal salt.

7,024.

The gas given off when NH4 Cl is heated with an alkali is

A.

H2

B.

Cl2

C.

N2

D.

NH3

Correct answer is D

No explanation has been provided for this answer.

7,025.

The diagram below illustrates a reproductive process in a farm animal. Study it and answer the question.

The foetus obtains dissolved oxygen and nutrients from the dam through the parts labelled

A.

I and II

B.

II and III

C.

I and III

D.

III and IV

Correct answer is D

The foetus obtains dissolved oxygen and nutrients from the dam through the parts labelled III and IV