Verified answer

Cual is used in declaritive statements.

-¡Ése es la policía el cual me puso una multa!

--That’s the police officer who gave me a fine!

Cuál is used in questions.

-¿Cuál es tu libro?

--Which is your book?

Difference Between Cual And Que

Usually the accentuated form is used in questions.

- ¿Cuál es tu casa? (which one is your house?)

- Le pregunté cuál era su nombre (I asked him what was his name.)

The form without accent is used as a relative pronoun or as a conjunction.

They look different, but I can't put my finger on it...