question_answer 66)

    Which of the following can undergo a chemical reaction? (a)                  (b)                   (c) (d)

Answer:

                  (d) In options (a) and (b), Fe is less reactive than Mg and Zn, so it is not able to replace these, hence, no reaction takes place. In option (c), Pb is less reactive than Mg, so it is not able to replace it, hence no reaction takes place. In option (d), Fe is more reactive than Cu, so it replaces Cu from, hence reaction takes place.