Question

Rust on weathered rocks is caused by _____.

saltation
oxidation
hydrolysis
abrasion

Answer 1

Answer: The correct answer is oxidation.

Step-by-step explanation:

Rust is a reddish-brown colored compound which is formed by the oxidation of Iron to form ferric oxide. The formula for this chemical compound is
`Fe-2O_3`

Oxidation is defined as the reaction in which addition of oxygen takes place.

The reaction for the formation of rust is given by the equation, we get:

`4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)`

By Stoichiometry,

4 moles of iron metal reacts with 3 moles of oxygen gas to form 2 moles of ferric oxide.

Hence, the correct answer is oxidation.

Answer 2

Rust on weathered rocks is caused by the process of oxidation. Oxidation is a process of chemical weathering that occurs when oxygen combines with minerals in rocks. rust occurs when oxygen combines with iron in rocks to form the reddish brown iron oxide.