Answer:
Situational irony is the literary technique that is used to denote the situation in which opposite happens as expected. The expectation of a person or situation falls below and the opposite of it happens. In the given scene in "The Story of an Hour" presents the use of situational irony. Mrs. Mallad wished for a long life. This became ironical because of the death of her husband. After the death of her husband, she thought that now she will have the life of an independent person. She anticipated he future very early. Mrs. Mallad died after her husband's death. His stands as a situational irony because her longing for a long life ended very early. Her expectation of a long life welcomed her death.