Can I control which nuke will be launched?
Solution 1:
No, there is no way to choose your nuke. They are launched in sequence. Meaning the nuke you build first gets shoot first.
This means you can choose the order before you build them, but you cannot change it afterwards.
Source: I opened a game, build 2 silos and tried everything to change the order. There just is no UI to change the order. I even tried to select 1 Ghost and 1 Silo while launching, still no effect.