Typically white wine is served chilled and red wine is served at room temperature. If the dessert wine is a white then I'd suggest serving it chilled. A Marsalla wine is a red wine that is also quite sweet and is usually served chilled.
It is white wine and should be served chilled.
Slightly chilled.
They both can it will extend the life of the wine if they are open but red wine should be consumed at 68 degree whites at 45. If they are just being stored cool dark and dry is the rule
The wine is chilled to drink right from the cooler,just open and pour.
Chilled and in a wine glass.
No it doesn't need to be refridgerated. If you are storing it for a long period it ia better to keep it in a cool, dry area, ideally a wine celler. About 2 hours before serving put it in the fridge and serve chilled. Interestingly, although white wine is served chilled for all WSET exams it is served at room temperature, the same as red wine!
Ice wine is just any type of wine that has been chilled or frozen.
Only if it is white or rose.
The wine will taste different from one served at a higher temperature.
Sauternes can be served at either room temperature or chilled. Chilling the wine will reduce its cloying sweetness.
There's no reason not to do so.