6 - As mentioned above, the height in meters should be shown. Don't forget that the metric system was adopted during the French Revolution and the Napoleonic Era. I would also accept any value between 1,65m and 1,7m.
11- I think "Final end" would mean that he died there, which is incorrect. This should be reformulated.
12 - It would be better to reformulate the question so that the answer is Wellington, it's the name under which he is better known (especially in other languages).
16 - If it were my quiz, I would accept, or even show "(Les) Cent-Jours".
23 - Louis 18 should indeed be accepted.