Jamb Chemistry Past Questions and Answers

Question 1661:

• JAMB 2012

Chlorination of water for town supply is carried out to

A. Make the water colourless
B. Remove germs from the water
C. Make the water tastedful
D. Remove odour from the water

Question 1662:

• 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 1663:

• 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 1664:

• 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 1665:

• 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