JAMB Chemistry Past Questions (2004)
Q1. Chlorine consisting of two isotopes of mass numbers 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotope of mass number 37.
A. 20
B. 25
C. 60
D. 75
Answer: B
Q2. sulphur (IV) oxide bleaches by
A. Reduction
B. Oxidation
C. Hydration
D. Absorption
Answer: A
Q3. Vulcanization involves the removal of
A. A monomer
B. The single bond
C. The double bond
D. A polymer
Answer: C
Q4. According to Charles law, the volume of a gas becomes zero at
A. 00C
B. -1000C
C. -2730C
D. -3730C
Answer: C
Q5. Calcium Tetraoxosulphate(VI) dissolves in water only sparingly to form a
A. Solution
B. Suspension
C. Precipitate
D. Colloid
Answer: D
Q6. A characteristic of the alkane family is
A. Addition reaction
B. Elimination reaction
C. Substitution reaction
D. Neutralization reaction
Answer: C
Q7. It is difficult to achieve an orderly arrangement of the molecules of a gas because they
A. Have no definite shape
B. Have little force attraction between them
C. Can collide with one another in the container
D. Are too small in size
Answer: B
Q8. Aluminium hydroxide is used in the dyeing industry as a
A. Salt
B. Dye
C. Mordant
D. Dispersant
Answer: C
Q9. The reaction above is
A. Carboxylation
B. Decarboxylation
C. Acidification
D. Esterification
Answer: B
Q10. Sodium metal is always kept under oil because it
A. Readily reacts with water
B. Is reduced by atmospheric nitrogen
C. Reacts vigorously on exposure to air
D. Reacts with oxygen and carbon(IV) oxide
Answer: C
Q11. In the production of soap, concentrated sodium chloride solution is added to
A. Increase the solubility of the soap
B. Decrease the solubility of the soap
C. Saponify the soap
D. Emulsify the soap
Answer: B
Q12. Oxyacetylene flame is used for iron-welding because it
A. makes the iron metal solidity very quickly
B. Combines with oxygen to give a pop sound
C. Evolves a lot of heat when burnt
D. Dissociates to produce carbon (IV) oxide and oxygen
Answer: C
Q13. Transition metals posses variable oxidation states because they have
A. Electrons in the d orbitals
B. Electrons in the s orbitals
C. A variable number of electrons in the p orbitals
D. Partially filled p orbitals
Answer: D
Q14. Which of the following gases can be collected by the method of downward delivery
A. Chlorine
B. Oxygen
C. Ammonia
D. Hydrogen
Answer: A