Hello, yes you can. However, this is not Google best practice but if you have small budget you can still advertise 2 domains in one account. Just make sure you create a separate campaign. Hope that help
Of course you can! As long as you stand in google's policies. A good tip is: Before you run your campaign, contact a adwords rep and ask of your landing pages are ok and stand in google's policies & terms. This is save you time and doubts and also give you a coverage in case anything wrong happens. Good luck
Yes. You can do. But keep a eye on your account. check the billing tab in adwords account so you will know how much amount it will be used.
Yes you can, but for the better segmentation and for tracking easily , I suggest use different accont for different domains (EXCEPT MCC)
Yes you can, Google doesn't have any restriction that says "You need to promote only one website through one adwords account" but it's upto you on managing multiple accounts through one account. It's better you promote one domain through one campain. so that you can get clear idea on seeing the campaign.