Potassium trioxochlorate(V) (KClO3) has a solubility of 1.5 mol dm−3 at 45°C. On cooling this solution to 20°C, the solubility becomes 0.5 mol dm−3. What mass of KClO3 crystallized out from 1 dm³ of solution? [K = 39, Cl = 35.5, O = 16]
1.00 g
10.00 g
12.25 g
122.50 g
Which of the following pollutants is associated with brain damage?
Carbon(II) oxide
Radioactive fallout
Biodegradable waste
Sulphur(IV) oxide
Which of the following will produce a solution with pH less than 7 at equivalence point?
HNO3 + NaOH
H2SO4 + KOH
HCl + Mg(OH)2
HNO3 + KOH
The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its
basicity
acid strength
pH
concentration
During a titration experiment, 0.05 moles of carbon(IV) oxide is liberated. What is the volume of gas liberated at s.t.p.?
22.40 dm³
11.20 dm³
2.24 dm³
1.12 dm³
