Wouldn't the acidic blood be vaporize durring the explosion? I say it would, because tremendous power from the bomb will leave no signs what so ever of the alien, nor the ground that it was standing on.
If it were a weaker bomb, strong enough to destroy the Alien fully, but not too strong to do proximty damage, then you are talking about a grenade going off, but instead of shrapnel, it would be burning acid.
Now for the Xeno eating a bomb... I think I know where he is coming from. I think he's talking about if the yautja and the xeno were fighting. The yautja bought itself some time by throwing the serphent away from only to set up his nuke. While he is doing that, the xeno would recover from the throw and charge at the predator to jump him, but the predator was quick enough to throw his nuke at the xeno as it jumped forward with the mouth wide open and the xeno caught it like a dog catching a fresbee.
Does that help? O_o;
In the moment of action remember the value of Silence and Order.
-Phormio of Athens