Question
A study by Gutierrez-Aguirre et al. found that using a compound of potassium and this anion to oxidize ethylene increased the shelf life of bananas. For 10 points each:
[10h] Name this anion, whose compound with potassium turns brown upon reacting with double or triple bonds in Baeyer's test.
ANSWER: permanganate [accept potassium permanganate; accept MnO4-]
[10e] Permanganate's central manganese atom has an oxidation state of plus this number, the number of electrons in the outermost shell of a halogen.
ANSWER: seven
[10m] Potassium permanganate is also widely used as a stain for this technique, during which a solvent is moved through a silica plate by capillary action.
ANSWER: thin-layer chromatography [accept TLC; prompt on chromatography]
<Science - Chemistry>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2025 PACE NSC | 06/07/2025 | Y | 36 | 11.67 | 86% | 8% | 22% |