Acids, bases and salts - Jamb Chemistry Past Questions and Answers

Question 81:

• 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 82:

• JAMB 1994

When sodium ethanoate is treated with a few drops of concentrated tetraoxosulphate(vi)acid. one of the products is

A. CH₃COOH
B. CH₃COOCH₃
C. CH₃COOC₂H₅
D. C₂H₅COOCH₃

Question 83:

• JAMB 1995

Neutralization involves a reaction between H₃O⁺ and?

A. CI^-
B. OH^-
C. NO₃^-
D. CO₃^2-

Question 84:

• JAMB 1995

A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?

A. Sulphur (lV) oxide
B. Hydrogen sulphide
C. Sulphide (lV) oxide
D. Hydrogen chloride

Question 85:

• JAMB 1995

Which of the following ions will give a white precipitate with aqueous NaOH and soluble in excess of the base?

A. Ca²⁺
B. Mg²⁺
C. Zn²⁺
D. Cu²⁺