Jamb Chemistry 1994 Past Questions and Answers

Question 31:

• JAMB 1994

SO₃ is NOT directly dissolved in water in the preparation of H₂SO₄ by the contact process because?

A. The reaction between SO₃ and water is violently exothermic
B. Acid is usually added to water and never water to acid
C. SO₃ does not dissolve in water readily
D. SO₃ is an acid gas

Question 32:

• JAMB 1994

In an electrolytic set-up to protect iron from corrosion, the iron is?

A. Made cathode
B. Made anode
C. Used with a metal of lower electropositive potential
D. Initially coated with tin

Question 33:

• JAMB 1994

Which of the following is NOT true of metals?

A. They are good conductors of electricity
B. They ionize by electron loss
C. Their oxides are acidic
D. They have high melting points

Question 34:

• JAMB 1994

Which of the following is the correct order of decreasing activity of the metals Fe, Ca, Al and Na?

A. Fe> Ca> Al> Na
B. Na> Ca> Al> Fe
C. Al> Fe> Na> Ca
D. Ca> Na> Fe>, Al

Question 35:

• JAMB 1994

Which of the following compounds is NOT an isomers of 2,2 dimethylbutane?

A. 2-methylbutane
B. 3-methylpentane
C. 2,3-dimethylbutane
D. 2-methylpentane