The victims were identified as Fatema Sultana, 29, daughter of Ekramul Quadir of the village, and her daughter Jakia Sultana, 2.
Lying on the bed at Sadar Hospital, Fatema said she was married off to Shahjahan Mollah of Narail six years back. He was a drug addict and used to torture her for dowry.
She got divorced last year and had been residing at her parents’ place at Chapra village since then.
When she and her daughter Jakia were asleep, Shahjahan came to her house in the early hours of Tuesday and requested her to open the window of her room.
As she opened it, he hurled acid on her face and fled the scene, leaving the duo burnt severely.
Abdus Salam, officer-in-charge of Ashashuni Police Station, said they visited the spot immediately after the incident and sent the victims to hospital.