Jamb Chemistry 1980 Past Questions and Answers

Question 16:

• JAMB 1980

Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?

A. When exposed to air, it slowy changes to liquid
B. Its solution in water conducts electricity
C. Its solution in water, on evaporationm gives a white solid
D. Its solution in water liberates hydroge when in contact with aluminium metal
E. Its oxide, when stronlgy heated, regenerates the elements X

Question 17:

• JAMB 1980

Which ONE of the following statements is true?

A. All alkali metals salts dissolves with dissociation in water
B. Most ionic substances are easily vaporized
C. Ionic substances exist only as liquid
D. Non-ionic substances are good electrolytes
E. Nitrogen exists in a trivalent state in ammonium salts

Question 18:

• JAMB 1980

When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?

A. Substitution
B. Addition
C. Polymerization
D. Hydrolysis
E. Reduction

Question 19:

• JAMB 1980

20 cm3 of 1 M H\(_2\)SO\(_4\) is mixed 20 cm\(^3\) of 1 M NaOH. The resulting solution is?

A. Acidic with a molarity of 0.50 M H₂SO₄
B. Acidic with a molarity of 0.25 H₂SO₄
C. Neutral
D. Alkaline with a molarity of 0.25 M NaOH
E. Alkaline with a molarity of 0.50 M NaOH

Question 20:

• JAMB 1980

Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?

A. Ethyl ethanoate
B. Methyl ethanoate
C. Ethyl methyl ketone
D. Butanol
E. None