Chemistry 2002 Jamb Past Questions and Answers

Question 1 :

• JAMB 2002

A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]

A. KClO₄
B. KClO
C. KClO₂
D. KClO₃

Question 2 :

• JAMB 2002

A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]

A. KClO₄
B. KClO
C. KClO₂
D. KClO₃

Question 3 :

• JAMB 2002

The formula CH₂ for ethanoic acid is regarded as its

A. Molecular formula
B. General formula
C. Empirical formula
D. Structural formula

Question 4 :

• JAMB 2002

A little quantity of trichloromethane (b.pt 60,^oC) was added to a large quantity of ethanol (b.pt 78,^oC). The most probable boiling point of the resultant mixture is from

A. 69 ^oC - 70 ^oC
B. 70 ^oC – 74 ^oC
C. 82 ^oC – 84 ^oC
D. 60 ^oC – 78 ^oC

Question 5 :

• JAMB 2002

The chromatography separation of ink is based on the ability of the components to

A. React with solvent
B. React with each other
C. Dissolve in each other in the column
D. Move at different speeds in the column