What does the "ii" in the name iron(ii) indicate about the cation?

It is indicating the oxidation state of Iron.

Explanation:

Oxidation state indicates the degree of oxidation or the charge of an element when it is forming a molecule or when it is in a ionic form (anion or cation). In the case of Iron (ii) or Fe(ii), it means that the oxidation state is 2 and as Iron form cations, its oxidation state is possitive, it means +2. In this state, Iron tend to combine with an anion (negative charge), forming a compound.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

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