No
All pickles need refrigeration, once the jar has been opened.
no,
Yes it does need regrigeration.
Once it's open, any mayo needs refrigeration.
Refrigeration
It slows their spoilage.
No
In my experience, a tuna fish sandwich can survive for some hours without refrigeration - you can take one to school with you in your lunchbox - but for any longer period of time, yes, it would need refrigeration.
YES!
yes, it does.
yes
it needs to be keped in the freezer