#1- Name the stolen JJ2 tiles on the planets Pollutus and Chameleon planet

Weren't those the planets that didn't have stolen tiles? IIRC, Carrotopolis 2 had Colonius sewer tiles with lava from (-) and Chelonia IV had Castle and (-) tiles.

#4- Only one Weapons Depot "clerk" appears twice. Name him/her.

Prof. Lapin, IIRC. (Can't check right now.)

#7- What is the name of the location all Single pak Deathmatch maps take place?

Uh... Chameleon World? I've only ever played multiplayer once.