Can I buy my Swiss Rail pass at the Zurich airport station??

you can buy the Swiss Youth Pass at the airport station for sure; i've bought those a few times there myself (that way, you don't need to pay extra for the Flughafen-Hauptbahnhof segment -- this segment isn't consistently checked for tickets since it's so short, but i have had an agent come by before). you can pay with a credit card, though it sounds almost like you already have Swiss currency? once you land in Zurich, get your luggage and follow the sign for "Bahn" (you'll need to exit and enter another adjacent building). there are ticket counters, though i'm not certain if you can buy the Swiss Pass there (i know at the Hauptbahnhof, if you go to the glass counters, they will redirect you to a special reservation office). there is also a special reservation office on the same basement level (i think it's next to the stairs leading to Tracks 3 and 4, or one of the other lower digits), and that's where i always buy my tickets. the agents there speak fluent english and will be able to suggest alternative passes, if you're not sure whether the Youth Pass will be the most economical choice.

Yes you can, and if for some reason you are unable to acquire one (cash desks shut) try and got to Zürich main Station -the largest in Switzerland - and there you will be able to get the pass.

Maybe yes. But I don't know!