yes, as long as it is in good condition. I would have it checked by a licensed gunsmith just so you don't have it blow up in your face.
yes
Yes.
Depends on what it is choked.
This for firearm saftey or somethin..... K the parts of a shotgun shell are the gunpowder primer casing and the bbs or slug
Yes: A Remington 870 shotgun with a modified choke will shoot any commercial shotgun slug.
Any non rifled slug. However for best perfomance you want a "saboted" slug.
A properly loaded shotgun shell slug load, yes.
Yes, but, DON'T DO IT!!!!!!!!
Yes, if it is a 10 gauge shotgun.
Yes
A slug is a mollusk like a snail, if you mean a slug like from a shotgun about length of shell, slug can also be slang for bullets which can be literally any size up to max.
Do not try it, the likelihood of the gun exploding in your hands is very high.