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Which of the following pollutants is associated with brain damage?
Carbon(II) oxide
Radioactive fallout
Biodegradable waste
Sulphur(IV) oxide
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
The solubilities of different solutes in a given solvent can be compared by
plotting their solubility curves on separate axes
plotting their solubility curves on the same axes
plotting some curves on the x-axis and others on the y-axis
plotting their solubility curves on the x-axis only
Chlorination of water for town supply is carried out to
make the water colourless
remove germs from the water
make the water tasteful
remove odour from the water
The chemicals used to soften hard water involve the addition of
insoluble sodium compounds forming soluble calcium and magnesium ions
soluble sodium compounds forming soluble calcium and magnesium ions
soluble sodium compounds forming insoluble precipitates of calcium and magnesium ions
insoluble precipitates of calcium and magnesium ions
