861 past contests
Topic 1 · Mass of co2 produced from complete combustion of a given mass of ethanol
Topic 26 · Systematic name for a structural isomer of butane (2-methylpropane)
Topic 6 · Solubility product: concentration from ksp, common-ion suppressed solubility, and ionic product after mixing
Topic 5 · Riddle: dichloromethane, a chlorinated organic solvent
Topic 25 · Free-radical halogenation: initiation conditions, unpaired electrons and homolytic fission (true/false)
Topic 29 · Periodic trends in first ionization energy and isoelectronic ionic radii (true/false)
Topic 5 · Maximum number of hydrogen atoms in a straight-chain compound with given halogens and double bonds
Topic 3 · Riddle: phenolphthalein, an acid-base indicator
Topic 3 · Acidic, basic or neutral nature of aqueous salt solutions from their parent acid/base strength (true/false)
Topic 6 · Effect of pressure on chemical equilibrium position (true/false)
Topic 1 · Calculating moles from mass using molar mass, including hydrated salts
Topic 26 · Constitutional isomers of a haloalkane (c5h11cl) with an alkyl substituent
Topic 14 · Riddle: nickel
Topic 7 · Oxidation states of fluorine, alkali metals and metal hydrides (true/false)
Topic 2 · Basic concepts of ion formation and ionic crystals (true/false)
Topic 5 · Systematic name of a carbonyl compound from its molecular formula