Question: Ìdógùn-ún jẹ́ àpapọ̀ pẹ̀lú àgbékalẹ̀ Fe_{èjì}O_{èta}. Èròjà wo ló parapọ̀ da ìdógùn-ún?
Options:
irin àti omi
irin àti afẹ́fẹ́ tí à ń mí sínú
irin àti afẹ́fé
irin àti ácíìdì
Answer: B