Water - Jamb Chemistry Past Questions and Answers

Question 11:

• JAMB 1983

2.5 g of a hydrate barium salt gave on heating, 2.13 g of the anhydrous salt. Given that the relative molecular mass of the of the anhydrous salt is 208, the number of molecules of water of crystallization of the barium salt is

A. 10
B. 7
C. 5
D. 2
E. 1

Question 12:

• JAMB 1983

Liquid X, reacts with sodium trioxocarbonate (IV) (Na₂CO₃) to give a gas which turns calcium chloride solution milky X is

A. Na₂SO₄(aq)
B. Kl (aq)
C. An alkali
D. An acid
E. A hydrocarbon

Question 13:

• JAMB 1983

Which of the following statements is FALSE?

A. Copper (ll) ion can be reduced to copper (l) ion by hydrochloric acid and zinc
B. Sodium metal dissolves in water giving oxygen
C. Nitrogen is insoluble in water
D. Carbondioxide is soluble in water
E. Lead has a higher atomic weight than copper

Question 14:

• JAMB 1984

Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?

A. 1 and 2
B. 2 and 3
C. 3 and 4
D. 1, 2, and 3
E. 2, 3, and 5

Question 15:

• JAMB 1984

Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of

A. Ca(OH)₂
B. CaCO₃
C. CaHCO₃
D. CaSO₄
E. N₂CO₃