Here you can find Google Chrome releases.

 * Google Chrome 20.0.1132.57 may be the last version of Chrome to be
   compatible with Mac OS X Leopard and because it?s from 2012, a lot
   of sites will not load, or say that a secure connection could not
   be establish.
 * Google Chrome 49.0.2623.112 is the last version to be compatible
   with 10.6, 10.7, 10.8, 10.9, and 10.10

Download #1 : Google Chrome 20.0.1132.57 (released in mid-2012)
Download #2 : Google Chrome 49.0.2623.112 (released in early-2012)
Download #3 : Google Chrome 21.0.1180.90 (released in late-2012)

Compatibility
Architecture: x86 (Intel:Mac)

As I cannot find any specific web page regarding the current Chrome
version I have, the only thing I can tell is that Google Chrome
20.0.1132.57 may be the last version that will run on Mac OS X
Leopard. And Activity Monitor reports the app as "Intel" and not
Universal.

As a final aside, no version of Chrome supported PowerPC.