Jamb Chemistry 1985 Past Questions and Answers

Question 36:

• JAMB 1985

Use the following option above to answer this question. Which of the following is the functional group of carboxylic acids?

A. A
B. B
C. C
D. D
E. E

Question 37:

• JAMB 1985

Which of the following conduct electricity?

A. Sulfur
B. Graphite
C. Diamond
D. Red phosphorus
E. Yellow phosphorus

Question 38:

• JAMB 1985

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is

A. C₈H₂₂O₃
B. C₆H₁₀O₃
C. C₁₂H₁₂O
D. C₆H₁₂O
E. C₃H₆O

Question 39:

• JAMB 1985

0.499g 0f CuSO₄.xH₂O when heated to constant weight gave a residue of 0.346g. the value of x is? (Cu = 63.5, S = 32.0, O = 16, H = 1)

A. 0.5
B. 2.0
C. 3.0
D. 4.0
E. 5.0

Question 40:

• JAMB 1985

In the experiment, which of the following observations would suggest that a solid sample is a mixture? The

A. Solid can be ground to a fine powder
B. Density of the solid is 2.25gdm^-3
C. Solid begins to melt at 573k but is not completely melted until 648k
D. Solid absorbs moisture from the atmosphere and turns into liquid
E. Solid melts at 300k