What architectural mistakes have you made in your career - what did you learn from them?
What architectural decisions are you proud of - how relevant are those ideas to other systems?
How much code should an architect write?
Have you been responsible for maintaining a complex system that you didn't design?
Number 2, 3 and 5 is asking about past jobs and may be even illegal depending on the applicant. NDAs are everywhere. Rephrase them to be generic.
Number 5 is worthless yes/no type of question as well.
On the subject of writing code - the question is really trying to find where on a spectrum someone is from:
"Code, I don't write code, I draw UML and throw it to our offshore development partners"
through to
"I always keep all the most complex and demanding parts of the development process to myself as everyone else is an idiot and only I can realize the amazing architectural vision I have <maniacal laugh>"
[And yes, the space probably isn't one dimensional and those probably aren't the endpoints] :-)
I've known extremely successful "architects" (in terms of £££$$$) who fit both of those descriptions...