Quebec was chosen because it was the first big settlement of the "Nouvelle-France". It is the oldest city of the Province of Quebec (and of the Canada).
Sorry to tell you but, nobody knows. I've searched everywhere for this but...
Uhhh.. i answered this for the retared people its Quebec City
As the name implies, it is a city. Quebec city is the capital of the Province of Quebec
The capital city of Quebec is Quebec city.