Jamb Chemistry 2001 Past Questions and Answers

Question 31:

• JAMB 2001

NH_3(g) + HCl_(g) → NH₄Cl_(s)
The entropy change in the system above is

A. Negative
B. Indeterminate
C. Positive
D. Zero

Question 32:

• JAMB 2001

Fermentation is the

A. Breaking down of carbohydrate to glucose
B. Conversion of sugar to alcohol in the presence of yeast
C. Breaking down of sugar to carbohydrate
D. Conversion of alcohol to sugar in the presence of yeast

Question 33:

• JAMB 2001

The general formula for the alkanals is

A. ROH
B. R₂CO
C. RCOOR¹
D. RCHO

Question 34:

• JAMB 2001

The main impurity in iron ore during the extraction of iron is

A. Silicon (IV) oxide
B. Carbon (IV) oxide
C. Calcium trioxosilicate
D. Sulphur (II) oxide

Question 35:

• JAMB 2001

During the vulcanization of rubber, sulphur is added to

A. Break down rubber polymer
B. Lengthen the chain of rubber
C. Bind rubber molecules together
D. Act as a catalyst