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

Question 66:

• JAMB 1991

Which of the following equimolar solutions, Na₂CO₃ Na₂ SO₄CI FeCI₃ CH₃COONa,
have pH greater than 7?

A. FeCI ₃ and NH ₄CI
B. Na₂CO₃, CH₃COONa and Na,Na₂SO₄
C. Na₂CO₃ and CH₃COONa
D. FeCI₃, CH₃COONa and NH₄CI

Question 67:

• JAMB 1991

Addition of aqueous ammonia to a solution of Zn⁺⁺ gives a white precipitate which dissolves in an excess of ammonia because?

A. Zinc is amphoteric
B. Zinc hydroxide is readily soluble
C. Zinc forms a complex which is readily soluble in excess ammonia
D. Ammonia solution is a strong base

Question 68:

• JAMB 1991

Which of the following, in clear solution, forms a white precipitate when carbon (IV) oxide is bubbled into it for a short time?

A. KOH
B. NaOH
C. Ca(OH)₂
D. AI(OH)₃

Question 69:

• JAMB 1991

Which of these is an acid salt?

A. K₂SO_4-.AI₂(SO₄)₃.24H₂O
B. CuCO₃.Cu(OH)₂
C. NaHS
D. CaOCI_2-

Question 70:

• JAMB 1992

wH₂SO₄ + xAI(OH)₃ → yH₂O + = zAI₂(SO₄)₃. The respective values of w.x.y and z in the equation above are?

A. 2,2,5 and 1
B. 3,2,5 and 2
C. 3,2,6 and 1
D. 2,2,6 and 2