Which of the following metals occur in free as well as combined state?
1. More reactive metals occur in the combined form where is less reactive metals occur as free metal in the nature give reasons
2. mention one use of each of the following
Copper,aluminium, phosphorus and hydrogen
The chemical reaction involved in the corrosion of iron metal is that of :
(a) oxidation as well as displacement (b) reduction as well as combination
(c) oxidation as well as combination (d) reduction as well as displacement