Iran has 1.55 Million Arabs, representing 2% of the Iranian population.

Typically, the Iranian view of Arabs is that they are less civilized Muslims. Iranians used to harbor a strong hatred of Iraq in particular because of the Iran-Iraq War, so older textbooks will rail specifically against Iraqis.

Yes. The Ahwaz Community represents the majority of Iranian Arabs. They live primarily in the provinces of Khuzestan and Hormozgan.

However, Persians are the dominant ethnic group in Iran, while Arabs are roughly 2% of the Iranian population.

Because it is a written law in Iranian Constitution. Any foreign woman married to a man who is an Iranian citizen, will automatically receive Iranian citizenship- whether you want it or not. They not required to renounce their foreign nationality. However, they are recognized only as Iranian based on Iranian government point of view.
You should then apply for an Iranian certificate of identity, a national ID card and an Iranian passport.

No.