I realise I answered Question 1 (the marriage one) incorrectly. This is because I did not think of married/unmarried as exhaustive:

• unmarried : has never been married
• married : is married right now
• divorced : was married, no longer married due to divorce
• widow : was married , no longer married due to the partner's death

the intent of the question was to consider unmarried = all possibilities other than married.

Is this a language issue? Wikipedia indicates there's at least some controversy on the use of "unmarried"

edit : Ok, no, that's actually controversy on the use of "single".