Harry Potter didn't kill the serpent but Neville Longbottom used Godric Gryffindor's sword to kill the serpent.
Severus Snape put the sword at the bottom of a lake and then led Harry to it.
The sword was Godric Gryffindor's sword.
a sword
Yes , he found the sword in the Forest of Dean
Harry used the sword of Godric Gryffindor.
Severus Snape.
It is in the hogwarts castle
it's called chamber of secrets. and faux the phoenix brings the sword to harry...
With Godric Gryffindor's sword...
Severus Snape.
Yes, Harry was forced to battle the Basilisk in the second book, Harry Potter and the Chamber of Secrets.Looking at the eyes of a Basilisk will kill you instantly - thankfully Fawkes blinded the Basilisk making the battle much easier. Harry managed to stab it through the roof of it's mouth with the sword of Gryffindor. However, one of the Basilisk's poisonous fangs went into his shoulder. Harry was healed by Fawkes healing tears.
Yes, Harry kills the Basilisk with the sword of Godric Gyffindor.