JAMB Chemistry Past Questions (2003)
Q1. What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm-3 solution [K2CrO4 = 194.2g mol-1]
A. 0.97g
B. 9.70g
C. 19.42g
D. 97.10g
Answer: A
Q2. According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to
A. Decrease
B. Increase
C. Remain constant
D. Be zero
Answer: B
Q3. CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
From the reaction above, calculate the standard heat change if the standard enthalpies of formation of CO2 (g), H2O (g) and CO (g) in kJ mol-1 are -394, -242 and -110 respectively.
A. -262 kJ mol-1
B. -42kJ mol-1
C. +42 kJ mol-1
D. +262 kJ mol-1
Answer: B
Q4. Which of the following is found in cotton
A. Starch
B. Cellulose
C. fat
D. oil
Answer: B
Q5. Which of the following is an electrolyte
A. Alcohol
B. Sodium acetate solution
C. Solid potassium hydroxide
D. Mercury
Answer: B
Q6. Farmlands affected by crude –oil spillage can be decontaminated by
A. Adding acidic solutions
B. Using aerobic bacteria
C. Pouring water on the affected area
D. Burning off the oil from the area
Answer: B
Q7. Which of the following ions is acidic
A. K+
B. NO-3
C. S2-
D. H3O+
Answer: D
Q8. A consequence of global warming is
A. Air pollution
B. Water pollution
C. Increased humidity
D. Flooding
Answer: D
Q9. In the electrolysis of a concentrated solution of sodium chloride using inert electrodes, which of the following ions are discharged at the cathode and anode respectively
A. Na+ and Cl-
B. Na+ and OH-
C. H+ and OH-
D. H+ and Cl-
Answer: D
Q10. When cathode rays are detected onto the electrode of an electrometer, the instrument becomes
A. Negatively charged
B. Positively charged
C. Neutral
D. Bipolar
Answer: A
Q11. Hydrogen can be displaced form a hot alkaline solution by
A. Fe
B. Cu
C. Ca
D. Sn
Answer: D
Q12. The salt that will form a precipitate soluble in excess ammonia solution is
A. Ca(NO3)2
B. Cu(NO3)2
C. Mg(NO3)2
D. Al(NO3)3
Answer: B
Q13. The process by which atoms are rearranged into different molecular structures in the petroleum refining process is referred to as
A. Catalytic cracking
B. Hydrocracking
C. Polymerization
D. Reforming
Answer: D
Q14. What is the percentage by mass of oxygen in Al2(SO4)3.2H2O
A. 14.29%
B. 25.39%
C. 50.79%
D. 59.25%
Answer: D
Q15. The commonest feature of the reactions at the anode is that
A. Electrons are consumed
B. Oxidation is involved
C. Ions are reduced
D. Electrode dissolves
Answer: B
Q16. The filter in a cigarette reduces the nicotine content by
A. Burning
B. Adsorption
C. Evaporation
D. Absorption
Answer: B
Q17. The formula for ethyl butanoate is
A. C3H7COOC2H5
B. C2H5COOC3H7
C. C4H9COOC2H5
D. C2H5COOC4H9
Answer: A
Q18. The structural component that makes detergent dissolve more quickly in water than soap is
A. –SO3 –Na+
B. –COO-Na+
C. –SO4- Na+
D. –COO-K+
Answer: A