According to most Sephardic traditions they are. However, Ashkenazi traditions forbid it.
It depends. If you are Ashkenaz, then you can't eat popcorn on Passover (Ashkenazim don't eat legumes on passover, and corn is a legume). If you are of a Sefard (who do eat legumes on Passover) origin, then you technically can eat popcorn on Passover, but it must have a reliable kosher for Passover certification.Correction:Corn is not a legume. The reason that corn isn't eaten during Passover is because of a naming error when it came to Europe and it became associated with one of the grains that the Torah forbids during Passover.
If you were able to find corn vinegar that is certified kosher for Passover, it would be kitniyot which means that the majority of Ashkenazi Jews would not use it.
The majority of sweetened condensed milks are made with corn syrup and are not certified kosher for Passover. There are substitution recipes though.
Yes. Fresh vegetables are all kosher for Passover, though Ashkenazi Jews do not eat certain ones, such as corn and legumes (peas, beans, etc.)
There are kosher brands of condensed milk, to be used during Passover, it would have to be certified kosher for Passover. In regard to sweetened condensed milk, most use corn syrup which is kitniyot. There are substitute recipes for this product though.
It generally contains corn syrup, and any derivatives of corn are not KfP for Jews of Ashkenazi descent.
It would have to be certified kosher for Passover.
The label has to say "Kosher for Passover"
Yes, only if they are specifically certified kosher for passover. You can find kosher for Passover olives at any Jewish supermarket
Is corn-on-the-cob hyphenated?
Corn - as in "corn on the cob".
It can be, it would require a valid Passover hechsher.