(i) Arrange Ca, Pb, Fe, Na, Zn, Cu, and Al in the decreasing order of their reactivity. (ii … of these is most likely to react with…
(i) The decreasing order of the given metals is as follows :
[Most reactive] Na, Ca, Al, Zn, Fe, Pb, and Cu [Least reactive]
(ii) (a) Sodium [Na].
(b) Copper [Cu].
(c) Sodium [Na] and calcium [Ca].