Newly married Shilpi, who lived in Rajouri Garden with her husband Deepak Sapra, consumed acid in Dwarka metro station last night, police said.
She died in a hospital, they said.
Her family alleged that she was harassed for dowry.
On the statement of the victim's brother, a case under sections relating to dowry death was registered, they said.
Deepak, his brother Yogesh and mother Usha were arrested.