Discussion
Which of the following statements regarding rusting of iron are true ?
(a) It involves a chemical reaction between iron and oxygen.
(b) It is an exothermic reaction.
(c) It can take place at room temperature.
(d) It is reversible reaction.
Answer: D
Statements a, b and c are true, so the answer is (a), (b) and (c).
Rusting is a chemical reaction in which iron combines with oxygen (in the presence of water) to form hydrated iron(III) oxide (a). Like other oxidation reactions it releases heat, though so slowly that it is not felt, so it is exothermic (b), and it happens at ordinary room temperature (c).
Statement d is false: rust does not turn back into iron on its own; getting the metal back requires reduction in a furnace. Options including d are therefore wrong.
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