Yes, I'd like to know that too. The Netherlands has the ABC islands (and arguably Aruba, Curacao and Sint Maarten), what exclaves does Belgium still have?
Belgium has dozens of exclaves in the Netherlands (Baarle Hertog, Baarle Nassau), just south of Tilburg. Look at it on Google maps, it's quite amusing. There are actually Dutch exclaves within the Belgian exclaves, within the Netherlands.
The ABC islands are not exclaves. An island by definition is surrounded by water, whereas an exclave, by definition, is surrounded by foreign territory.
Question 3 is misleading, particularly the explanation "Netherlands have Dutch". Dutch is not unique to the Netherlands, as it is an official language in Belgium and Suriname as well.
You are right about that, but what I mean with that is that there is a language which originates in this country and is the most spoken language there.
If that's what you mean, then I would suggest changing the wording of the question to reflect that. The way it's written now is very confusing. It would in fact be hard to nail down whether dutch originated in the Netherlands or in Flanders first, whether it co-evolved in both locations, given that Belgium and the Netherlands were part of the same country/kingdom for much of the language's evolutionary past.
How would you put it? And Flanders has its own language, Vlaams. Which is the flemish version of Dutch, but not Dutch. And furthermore the Dutch (and Flemish) word for Dutch is Nederlands.
I would probably just put in an entirely different question. It is too complex an issue. In your own reply you just said that "Flanders has its own language, Vlaams". This then automatically negates the answer to your question about which country does not have its own language. I don't think you can nail down "ownership" of the "Nederlands" language, and that doesn't even begin to cover the regionally official language status of Friesian (is it unique to Netherlands, or is it similar enough to East Frisian in Germany???). Lots of other good questions available about BENELUX!
I exchanged the unique language question with the Tour de France one and the separatist party one with the chocolate question, because separatist parties are not something a country should be famous for IMAO.
Brussels technically has only 200.000 inhabitants while Antwerp has 500.000