Jamb Chemistry 1991 Past Questions and Answers

Question 31:

• JAMB 1991

Which of the following gases will rekindle a brightly glowing splint?

A. NO₂
B. NO
C. N₂O
D. CI₂

Question 32:

• JAMB 1991

Which of the following salts can be melted without decomposition?

A. Na₂CO₃
B. CaCO₃
C. MgCO₃
D. ZnCO₃

Question 33:

• JAMB 1991

Oxygen gas can be prepared by heating?

A. Ammonium trioxonitrate (V)
B. Ammonium trioxonitrate (III)
C. Ppotassium trioxonitrate (V)
D. Mamgamese (IV) oxide

Question 34:

• 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 35:

• 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