Which chemical process is being described below?

Iron+Oxygen+Moisture = Iron Oxide

Q. Assertion :Rusting of iron is considered an oxidation reaction. Reason: Rust is another name for iron oxide which occurs when iron is exposed to oxygen and moisture for a long period of time. Overtime the oxygen combines with the metal at atomic level forming a compound called an oxide. Rust forms when iron undergoes oxidation. The main catalyst for the rusting process is water.

Q. Consider the following statements.

A - Iron + Moisture + Oxygen = Iron Oxide.

B - The rust that develops in rocks with iron content cannot be removed, thereby, keeping the original structure of the rock intact.

Identify the correct statements.

Q.

Why is the chemical formula of iron oxide Fe₃O₄ when the valency of iron is 2,3 and that of oxygen is 2

Q.

Corrosion of iron in presence of oxygen leads to reddish brown powder (Iron oxide). This process is called __ of iron.