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.
1
(a), (b) and (c)
2
(a), (b), (d)
3
(b) and (c)
4
(a) and (d)