Sub-topic 1
2013 · National Preliminary
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Methods of concentrating gold ore: cyanidation, amalgamation, and the purpose of roasting
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Sub-topic 2
2016 · National One-Eighth
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The blast furnace flux is limestone, not sand (true/false)
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Sub-topic 3
2017 · National Semifinal
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Balancing the roasting equation of antimony sulfide (stibnite)
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Sub-topic 4
2017 · National Quarterfinal
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Mercury amalgamation concentrating gold in small-scale (galamsey) mining
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Sub-topic 5
2020 · National One-Eighth
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Balanced equation for roasting iron pyrites
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Sub-topic 6
2021 · National Preliminary
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Metallurgy as the study of metals, their extraction, and their properties
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Sub-topic 7
2021 · National Quarterfinal
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Canned food is called tinned food because the cans are coated with tin metal
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