No a PS2 game is not going to work on a PS1. The PS2 games are DVDs and the PS2 is more advanced
most of them can be played on a playstation 2
No it does not
yes
No.
Yes, a Region 3 PlayStation 3 game will work on a Region 1 PlayStation 3 system. The PlayStation 3 does not have regional lockouts for PlayStation 3 games. It does however have regional lockout for PlayStation games, PlayStation 2 games, DVD movies, and Blu-ray movies.
No the games for the PS2 do not work on the original PlayStation that the PS2 replaced
yes
Yes.
Yes they can.
Yes it can be played.
no
No. You can play Legitimate PS1 games on a chipped PS2, but you cannot play PlayStation 2 Games on a PlayStation 1.