Solubility - Jamb Chemistry Past Questions and Answers

Question 61:

• JAMB 2003

The structural component that makes detergent dissolve more quickly in water than soap is

A. -SO₃- Na⁺
B. -COO-Na^-
C. -SO₄- Na⁺
D. -COO-K⁺

Question 62:

• JAMB 2004

The solubility in mol dm/^-3 of 20g of CuSO₄ dissolved in 100g of water at 180^o is
[Cu = 64, S = 32, O =16]

A. 0.13
B. 0.25
C. 1.25
D. 2.00

Question 63:

• JAMB 2005

When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of

A. NaHSO₄
B. Na₂SO₃
C. NaHSO₃
D. Na₂SO₄

Question 64:

• JAMB 2005

Kerosine is commonly used to remove the red colour stain of palm oil from cloths because it

A. Helps to spread the oil over a larger surface area
B. React with the oil to form an odourless compound
C. Makes the oil evaporate easily by dissolving it
D. Helps to dilute the oil and reduce its colour

Question 65:

• JAMB 2006

When 50cm² of a saturated solution of sugar of molar mass 342 g at 40^oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40^oC is

A. 2.0 mol dm^-3
B. 3.5 mol dm^-3
C. 7.0 mol dm^-3
D. 10.0 mol dm^-3