Jamb Chemistry 2012 Past Questions and Answers

Question 16:

• JAMB 2012

The solubilites of different solutes in a given solvent can be compared by

A. Plotting their solubility curves on separete axes
B. Plotting their solubility curves on the same axes
C. Plotting some of the solubility curves on the x-axis and others on the y-axis
D. Plotting their solubility curves on the x-axis only

Question 17:

• JAMB 2012

Potassium trioxochlorate (V)has a solubility of 1.5 mol dm ^-3 at 45 ^oC.On cooling this solution to a temperature of 20 ^oC, the solubility was found to be 0.5 mol dm ^-3. What mass of KCIO ₃ was crystalized out?
[K = 39, Cl = 35.5 O =16]

A. 1.00g
B. 10.00g
C. 12.25g
D. 122.50g

Question 18:

• JAMB 2012

Which of the following pollutants is associated with brain damage?

A. Carbon (ll) oxide
B. Radioactive fallout
C. Biodegradable waste
D. Sulphus (lV) oxide

Question 19:

• JAMB 2012

Which of the following will produce a solution with pH less than 7 at equivalent point?

A. HNO ₃ +NaOH
B. H ₂SO ₄ + KOH
C. HC +Mg (OH) ₂
D. HNO ₃ + KOH

Question 20:

• JAMB 2012

The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its

A. Basicity
B. Acid strength
C. PH
D. Concentration