"The apples are not dirty, they are clean."

Translation: Merele nu sunt murdare, ele sunt curate.

[NicolaHuzu]

The 'ele' in this sentence is incorrect? Am i right?

[relox84]

No, 'ele' is correct here. 'Ei' is used for masculine plural nouns, and 'ele' for feminine and neuter plural nouns, and 'merele' is a neuter plural noun.
However you can safely drop it from the sentence and only use "sunt curate".