Solubility - Jamb Chemistry Past Questions and Answers

Question 56:

• JAMB 2000

The diagram above is the solubility curve of a solute, X. Find the amount of X deposited when 500cm³ of a solution of X is cooled from 60^oC to 20^oC.

A. 0.750 mole
B. 0.950 mole
C. 2.375 moles
D. 4.750 moles

Question 57:

• JAMB 2002

When H2S is passed into a solution of iron (III) chloride, the solution turns

A. Pale green
B. Pale red
C. Brown
D. Colourless

Question 58:

• JAMB 2002

The solubility of a salt of molar mass 101g at 20^oC is 0.34 mol dm^-3. If 3.40g of the salt is dissolved completely in 250cm³ of water in a beaker, the resulting solution is

A. A suspension
B. Saturated
C. Unsaturated
D. Supersaturated

Question 59:

• JAMB 2002

The gas that gives brown colouration in brown ring test is

A. NO
B. CO₂
C. NO₂
D. CO

Question 60:

• JAMB 2002

Which of the following gives a precipitate when treated with NaOH solution?

A. AlCl₃
B. NH₄CL
C. CH₃COONa
D. Na₂CO₃