Jamb Chemistry Past Questions and Answers

Question 176:

• 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 177:

• 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 178:

• 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 179:

• 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

Question 180:

• JAMB 1980

Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass number 35 nad 37, what is the percentage composition of the isotope of mass number 35?

A. 20
B. 25
C. 50
D. 75
E. 90