JAMB Chemistry Past Questions (2001)
Q1. The main impurity in iron ore during the extraction of iron is
A. Silicon (IV) oxide
B. Carbon(IV) oxide
C. Calciumtrioxosilicate
D. Sulphur(II) oxide
Answer: A
Q2. Cancerous growths are cured by exposure to
A. ɣ-rays
B. β – rays
C. ἀ – rays
D. X -rays
Answer: A
Q3. Four elements W, X, Y, and Z have atomic numbers 2, 6, 16 and 20 respectively. Which of these elements is a metal
A. X
B. W
C. Z
D. Y
Answer: C
Q4. What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of air
A. 15.00cm3
B. 6.00cm3
C. 0.63cm3
D. 0.06cm3
Answer: B
Q5. The pollution from petroleum spillage in rivers and lakes can best be dispersed by
A. Pouring detergents
B. Passing of ships through the area
C. Pouring organic solvents
D. Evaporation
Answer: A
Q6. As the concentration of an electrolyte reduces, the conductivity
A. Reduces to zero
B. Decreases
C. Increases
D. Is unaffected
Answer: B
Q7. Catalytic hydrogenation of benzene produces
A. Oil
B. Cyclohexane
C. Cycloexane
D. Margarine
Answer: C
Q8. When ΔH is negative, a reaction is said to be
A. Ionic
B. Reversible
C. Exothermic
D. Endothermic
Answer: C
Q9. An oxide X02 has a vapour density of 32. What is the atomic mass of X [O = 16]
A. 32
B. 20
C. 14
D. 12
Answer: A
Q10. Which of the following statements is correct about the average kinetic energy of the molecules of a gas
A. It inctreasaes with increase in pressure
B. It increases at constant pressure
C. It increases with increase in temperature
D. It increases in volume
Answer: C
Q11. A trihydric alkanol is
A. glycerol
B. phenol
C. glycol
D. ethanol
Answer: A
Q12. 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
Answer: C
Q13. When sodium reacts with water, the resulting solution is
A. weakly acdic
B. neutral
C. acidic
D. alkaline
Answer: D
Q14. The general formula for the alkanals is
A. ROH
B. R2CO
C. RCOOR1
D. RCHO
Answer: D
Q15. Deliquenscent substances are used for
A. Cooling
B. Wetting
C. Melting
D. Drying
Answer: D
Q16. Phosphorous is stored under water to precvent it from
A. Dehydrating
B. Becoming inert
C. Smelling
D. Catching fire
Answer: D