861 past contests
Topic 14 · Thermal decomposition products of lead(ii) nitrate
Topic 25 · Balanced combustion equation for 2-methylheptane in excess air
Topic 22 · Riddle: hexylamine, a primary amine analogous to ammonia
Topic 34 · H2s precipitates zinc sulfide but not a stable aluminium sulfide in aqueous solution (true/false)
Topic 37 · Lead(ii) hydroxide, being amphoteric, dissolves in excess naoh (true/false)
Topic 34 · Dilute ammonia does not precipitate calcium hydroxide from calcium ion solution (true/false)
Topic 3 · Strong acids have weak conjugate bases (true/false)
Topic 3 · Solutions with ph equal to zero do exist (true/false)
Topic 38 · Volume of oxygen at stp from the electrolysis of alumina, given the aluminium yield
Topic 3 · Lower pka, not higher, indicates a stronger acid (true/false)
Topic 9 · Balanced equation for the softening reaction of temporary hardness with slaked lime
Topic 18 · Nicotine as the addictive compound in tobacco
Topic 7 · Concentration of iodine from a thiosulfate titration (1:2 ratio)
Topic 7 · Volume of kmno4 needed to react with a given volume/concentration of oxalate (2:5 ratio)
Topic 7 · Volume of kmno4 needed to react with a given volume/concentration of fe2+ (1:5 ratio)
Topic 33 · Mercury amalgamation concentrating gold in small-scale (galamsey) mining
Topic 14 · Recovering gold from a cyanide complex by zinc displacement
Topic 14 · Recovering gold from amalgam by heating, and the mercury vapour health hazard
Topic 20 · Mass of dissolved calcium hydrogencarbonate in a large volume of water from its % w/v concentration
Topic 9 · Balancing and applying the softening reaction of temporary hardness with slaked lime