It is unknown.
There are none.
It is unknown.
Lets see: Petrificus Totalus; Stupify; Crucio; Avadra Cadavra; Imperio. The last 3 are the 3 unforgivable curses.
Yes he does, but only Imperio and Crucio not the Avada Kadavra.
Avada Kedavra. The spell is avada kedevra and it emits a green flash of light form the wand which kills instantly
Yes it is known as one of the Unforgivable Curses which is illegal to use. The purpose of the Imperius Curse is to control the victim and you can do anything you want to do to them. The other Unforgivable Curses are: Crucio, which inflicts horrible pain. It was used on Neville Longbottom's parents and they lost their minds. Avada Kedavra, the killing curse.
The three unforgivable cures are: Avada Kedavra which is pronounced a-VAH-dah ke-DAH-vra. Imperio which is pronounced im-PEER-ee-oh. Crucio which is pronounced KROO-see-oh.
In the seventh book in the room of requirement they do talk, and have unsurprisingly low verbal skills. Most of what they say are unforgivable curses.
Harry Potter has used two unforgivable curses. In the Order of the Phoenix he used the Cruciatus curse on Bellatrix Lestrange, then in the Deathly Hallows he used the Imperius curse to break into Gringotts.
Avada Kedavra. It's the worst of the three Unforgivable Curses and a favorite of Lord Voldemort. It is also known as the killing curse. Harry Potter is the only person known to survive Avada Kedavra.
"Crucio" Cruciatus Curse - torture curse"Imperio" Imperius Curse - mind controlling curse"Avada Kedavra" Curse - killing curseThese three illegal spells are more infamously known as The Unforgivable Curses.
Potentially he's powerful and hates LV enough to do it but Harry won't the so called "love" and his intrinsic goodness means he'd probably never cast an unforgivable in an all out duel but if he was wound up enough he probably could. Unforgivable curses need serious intent to harm to cast that's why Harry couldn't torture Bellatrix properly in OOtP which i always thaught was odd considering he could torture someone for spitting at his head of house. He regularly uses Imperio in DH. So no there's no real reason why he couldn't but if he's using AK unless the story is AU in some way it might not work on LV who has horcruxes etc.etc