No
Absolutely! Unless it is canned & unopened.
Refrigerating will help maintain its flavor; however, if you prefer your mustard to be room temperature, it is not necessary. There are no ingredients in mustard that spoil.
Whether or not baked goods with sweetened condensed milk needs to be refrigerated depends on what else in the dish. A cookie like baked good would not need refrigeration. A custard type dish would.
If you open the bottle, you need to keep it refrigerated and it will last for a month. If it is an unopened bottle it should last for about a year :)
Can I return an unopened bottle of alcohol.
Unopened milk can spoil even while refrigerated because there are tons of bacteria in the milk, and if they start reproducing, that will cause much more waste, therefore souring the milk.
It may be depending on age
2 years
Yes
After you open a can of baked beans, you should refrigerate the leftovers in a separate container. (the opened can would rust in the fridge)
No.