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Gold ingot
No but you can get zombie pigmen, netherrack or glowstone with a nether reactor
Zombie Pigmen Zombie Enderdragon Enderman Skeleton Spider Cave Spider Creepers Ghast Blaze
Smite is an enchantment you can put on swords. With it, you can do extra damage to zombies, zombie pigmen, and skeletons.
Smite increases damage against zombies, skeletons and zombie pigmen.
No, however, you can kill Zombie Pigmen to get 0-1 gold nugget. Also, 9 gold nuggets can be crafted into 1 gold ingot.
It's possible with a InvEditor or a MapEditor (cheats)
Yes, in the Nether Zombie Pigmen spawn on the netherrack but I don't think they spawn on Netherrack in the Overworld.
This enchantment harms undead creatures like skeletons, Zombies, wither skeletons, zombie pigmen, and wither. It adds 2.5 hearts of damage to each of your hits.
You can't the nether isn't implemented yet but you can get netherack, zombie pigmen, and glowstone by making a nether reactor
zombie pig man are just zombies with pigs faces found in the nether. they wont attack you unless you attack them. on the real world (not the nether), if lightning strikes a pig, it will turn into a zombie pig man during the night.
No not right now, the only hostile mobs are Zombies, Spiders, skeletons, creepers, and zombie pigmen (nether reactor only) but it would be cool if there was.