Will there ever be a nuke war?

Answer 1

It's a pure speculation to predict nuclear war. That said, here are some possibilities, ranked from the current "most likely" to "least likely".

1. India vs Pakistan
2. India vs China
3. North Korea vs US/South Korea
4. Iran vs Israel

Note that a major nuclear exchange between any of the Big 5 (US, Russia, UK, France, China) is exceedingly unlikely at this point.

In fact, after India vs Pakistan, by far the most likely scenario is a sub-state actor (e.g. terrorist organization) acquiring a nuclear weapon and detonating it in a nuclear-equipped country. That scenario is very frightening, as it would almost certainly plunge the entire world into massive political chaos.

As I noted about, this is merely an educated guess, based on current tensions and possibilities. It's certainly not a prediction.