Jamb Chemistry Past Questions For Year 1985
Question 1
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
Question 2
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 3
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 4
Which of the following conduct electricity?
- A. sulfur
- B. graphite
- C. diamond
- D. red phosphorus
- E. yellow phosphorus
Question 5
A certain volume of gas at 298k is heated such that its volume and pressure are now four times the original values. What is the new temperature?
- A. 18.6k
- B. 100.0k
- C. 298.0k
- D. 1192.0k
- E. 4768.0k
