No, not all Nespresso capsules are kosher, this is mainly dependent on which country they're manufactured in. You would need to check the packaging for a reliable hechsher.
The capsules manufactured in Orbe and Avenches, Switzerland are certified by
Rabbi Dr I M Levinger of the Basel Kosher Commission.
Some are, some aren't. Check the package.
It would have to be certified kosher for Passover.
Yes, only if they are specifically certified kosher for passover. You can find kosher for Passover olives at any Jewish supermarket
Yes, it must be certified kosher for Passover though.
Only if it's certified kosher for Passover.
Yes, they must be certified kosher for Passover though.
Pareve kosher for Pesach margerine is available at kosher butchers and some supermarkets that stock a large Passover inventory.
Yes, it is certified by the OU as kosher, pareve, but not for Passover.
You might be able to find kosher for Passover wafer cones, however, they will have to be certified as such by a reputable hechsher.
All salt is kosher unless something is added to it to make it not kosher. Like all other seasonings, the specific package must be certified kosher for Passover.
It depends on the brand. However, even brands of real mustard that are certified kosher for Passover are still kitniyot.
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.
Both are fine but have to be certified kosher for Passover.