Chemistry Past Questions and Answers

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:

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:

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:

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:

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