Question 1 - The advertisement may be an offer for sale as it comes from the manufacture and the wording of the advertisement displays an intention to be bound with the first ten people who accept the offer, thereby removing the problem of multiple acceptance.

Question 2 - The advertisement may be on offer as the advertisement limits the number of scarfs available to just ten, thereby removing the problem of multiple acceptance.

Offer & Acceptance, Misrepresentation, Consideration