Question

[TBQ.VI.3]
What is rust? Give the equation for
formation of rust.

Answer 1

Rust is hydrated ferric oxide, ${\mathrm{Fe}}_2{O}_3.{\mathrm{xH}}_{2}O.$ It is formed when iron is exposed to moist air.

$4\mathrm{Fe}+3O_2+{\mathrm{xH}}_{2}O\to 2{\mathrm{Fe}}_2{O}_3.{\mathrm{xH}}_{2}O$