Solubility - Jamb Chemistry Past Questions and Answers

Question 11:

• JAMB 1981

5cm³ of a saturated solution of sodium chloride at 30°C gave, on careful evaporation, 1.95g of solid salt. The solubility of sodium chloride at 30°C?
(Na = 23, Cl = 35.5)

A. 5.00 mole dm³
B. 5.67 mole dm³
C. 6.00 mole dm³
D. 6.67 mole dm³
E. 7.00 mole dm³

Question 12:

• JAMB 1981

What mass of sodium carbonate solution is in 500 cm³ of 0.1 molar sodium carbonate solution?
(Na = 23, C = 12, O = 16)

A. 10.6 g
B. 5.3 g
C. 500 g
D. 10 g
E. 20 g

Question 13:

• JAMB 1982

Sodium carbonate crystals on exposure to a dry atmosphere change to a white powder. This phenomenon is known as?

A. Deliquescence
B. Hygroscopy
C. Oxidation
D. Efforescence
E. Sublimation

Question 14:

• JAMB 1982

When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?

A. H₂S
B. Ag₂S
C. PbS
D. HNO₃
E. S

Question 15:

• JAMB 1982

Magnesium ribbon was added to each of the following aqueous solution in turn: H₂SO₄, AgNO₃, HNO₃, HCl, NH₃, HCl, NH₃. In which case does the magnesium become covered with a dark precipitate?

A. H₂SO₄
B. AgNO₃
C. HNO₃
D. NH₃
E. HCl