WAEC Past Questions and Answers - Page 1826

9,126.

Which of the following is a waste product in the Solvary Process for the manufacture of sodium trioxocarbonate (IV)?

A.

Ammonium chloride

B.

Brine

C.

Limestone

D.

Calcium oxide

E.

Calcium chloride

Correct answer is E

No explanation has been provided for this answer.

9,127.

Which of the following correctly explains why iodine crystals change directly into the gaseous state when heated?

A.

lodine crystals sublime

B.

lodine atoms are held together by strong forces

C.

lodine molecules are held together by weak forces

D.

lodine molecules are covalent

E.

lodine is a solid at room temperature

Correct answer is C

No explanation has been provided for this answer.

9,128.

Which of the following equations represents the reaction of chlorine with hot concentrated sodium hydroxide solution?

A.

2KOH+CI2 → KCIO + KCI + H2O

B.

4KOH + 2CI → 4KCI + 2H2O + O2

C.

6KOH + 3CI2 → KCIO3 + 5KCI + 3H2O

D.

2KOH + CI2 → 2KCI + H2O2

E.

KOH + 2CI2 + H2O → KCI + 3HCI + O2

Correct answer is C

No explanation has been provided for this answer.

9,129.

On a curve for the law of diminishing returns, maximum output is obtained at the

A.

Beginning of the curve

B.

End of the curve

C.

Apex of the curve

D.

Middle of the curve

Correct answer is C

No explanation has been provided for this answer.

9,130.

In a crop production enterprise, a fixed factor of production could be the

A.

Size of the land

B.

Amount of labour required

C.

Amount of capital employed

D.

Entreprenurial skill of the farmer

Correct answer is A

No explanation has been provided for this answer.