One of These is Not Like the Others

There is something similar about three of the entries in each set. Can you identify the odd one out?
None of these categories are numerical cutoffs
Remember, the three you don't select have to belong to a meaningful category.
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MiracleMax
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Last updated: May 10, 2020
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First submittedMay 10, 2020
Times taken56
Average score25.0%
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1. Select the odd one out
Seven Summits
Denali
Matterhorn
Vinson Massif
Puncak Jaya
2. Select the odd one out
One-Border Countries
Indonesia
Gambia
United Kingdom
South Korea
3. Select the odd one out
Countries which share a name with their capital
Djibouti
Singapore
Luxembourg
Liechtenstein
4. Select the odd one out
Commonwealth Countries
South Africa
Nigeria
Belize
Thailand
5. Select the odd one out
Generals
Richard Wagner
Geronimo
Hideki Tojo
Ulysses S. Grant
6. Select the odd one out
US National Parks
North Cascades
Everglades
Ozark Highlands
Olympic
7. Select the odd one out
Mexican States
Monterrey
Tabasco
Jalisco
Sonora
8. Select the odd one out
Saltwater Lakes
Lake Titicaca
Dead Sea
Great Salt Lake
Salton Sea
9. Select the odd one out
Coastal Cities
Durban
London
Mumbai
Lima
10. Select the odd one out
Native to the Americas
Cranberry
Corn
Apple
Potato
11. Select the odd one out
Drain to the Atlantic
Amazon
Ganges
St. Lawrence
Thames
12. Select the odd one out
State/Province Capitals
Colorado Springs
Toronto
Sydney
Cayenne
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2 Comments
+1
Level 88
May 10, 2020
Why isn't Lesotho the odd one out in 2, since it's the only land-locked one, Djibouti the odd one out in 3 since it's the only one with a low HDI, New Zealand the odd one out in 4 since it's the only island, the Everglades the odd one out in 6 since it's the only lowland region, Durban the odd one out in 9 since it's the only one one with an urban agglomeration population below 10 million, Potato the odd one out in 10 since it's the only one where the root is eaten, Thames the odd out in 11 since it has a discharge that is orders of magnitude smaller than the others, and Cayenne the odd one out in 12 since it's the only one where English is not the main language spoken?
+2
Level 73
May 10, 2020
I suspected I'd miss a few alternate sets. The Lesotho, New Zealand, and Cayenne questions have been fixed. I think arbitrary numberical cutoffs (for population, HDI, discharge) pretty clearly aren't insular categories, but I've noted that in a caveat. Also "lowland region" isn't meaningful. All of those places are in significantly different geological & ecological provinces. Also, Ozark Highlands isn't even a national park, making it the obvious choice.

Remember, it's not just picking the odd one out- the rest have to belong to a meaningful category. "plants where you don't eat the root" isn't really a cohesive category.