WAEC Chemistry Past Questions & Answers - Page 200

996.

If 10 cm 3 of distilled water is added to 10 cm3 of an aqueous salt solution, the concentration of the solution

A.

increases

B.

decreases

C.

remains constant

D.

doubles

Correct answer is B

No explanation has been provided for this answer.

997.

Sugars can be hydrolyzed at room temperature by the action of

A.

mineral acids

B.

strong bases

C.

enzymes

D.

oxidants

Correct answer is C

Simple sugar molecules (monosaccharide ) when combined to form larger molecules (dissacharides or polysaccharides) is called condenation , water molecules is generated in the process, the reverse process is known as hydrolysis. sugar can be hydrolyszed at room temperature by the action of enzymes.

998.

Which of the following constitutes an advantage in the use of hard water?

A.

Formation of scum with soap

B.

Furring of kettles

C.

Blockage of water pipes

D.

Formation of strong bones

Correct answer is D

No explanation has been provided for this answer.

999.

What is the function of H2SO4 in the following reaction? C12
H22O11 conc. H24 12C + 11H2O

A.

Oxidizing agent

B.

Strong acid

C.

Dehydrating agent

D.

Catalyst

Correct answer is C

No explanation has been provided for this answer.

1000.

Which of the following polymers contains nitrogen?

A.

Nylon

B.

Polyvinyl chloride

C.

Polyethene

D.

Cellulose

Correct answer is A

No explanation has been provided for this answer.