Question

Name a metal found in the earth's crust:
(i) in free state and
(ii) in the form of its compound.
State where each of these metals are placed in the reactivity series of metals

Hint:

Metals found in free state are usually those that are least reactive, like gold, whereas metals in compound forms like aluminium are more reactive.

Answer 1

(i) Free State Occurrence: Gold (Au), a metal with low reactivity, exists freely within the Earth's crust.
(ii) Compound Form Occurrence: Aluminium (Al), a highly reactive metal, is found in compound form, such as bauxite.
Therefore, gold exhibits low reactivity, whereas aluminium displays high reactivity.