The suspect, Yudishsthir Yadav, went to the victim's house Wednesday and locked the girl and her mother in a room.
He then went to the kitchen, boiled water and threw the entire pot of water on her face when he re-entered the room, Gulf News reported.
The victim suffered severe burns and is undergoing treatment at a hospital.
Police are searching for the suspect who had become friends with the girl through Facebook a year ago.
Recently, Yadav began posting strange comments to his wall, and the victim removed him as a friend, leading to the attack.