Question

Is aluminium more reactive than iron?

Answer 1

Hint: We have to know that metallic aluminum is extremely responsive with climatic oxygen. It structures aluminum oxide that is liable for the obstruction of metallic aluminum to enduring. This layer shields the metal from additional oxidation. The thickness and properties of this oxide layer can be improved utilizing an interaction called anodizing.

Complete answer:
At the point when iron erodes, it structures red-earth colored hydrated metal oxide, $F{e_2}{O_3}.x{H_2}O$ (rust). Rust, is unequipped for giving tight defensive oxide film, rather this item framed drop off effectively consequently presenting new metal to the erosion medium (oxygen and water). The development of rust requires iron, water and oxygen. In spite of the fact that it's an intricate interaction, the synthetic condition is,
$4Fe + 3{O_2} + 6{H_2}O \to 4Fe{\left( {OH} \right)_3}$
If there should arise an occurrence of aluminum, when the metal is presented to the environment a nonporous follower layer of aluminum oxide is shaped over the outside of metal forestalling any contact of new metal with erosion medium. Its surface is covered with a dainty layer of oxide that shields the metal from assault via air. Notwithstanding, in the event that the oxide layer gets harmed and the aluminum metal gets uncovered, it responds again with oxygen shaping amphoteric oxide aluminum (III) oxide.
$4A{l_{\left( s \right)}} + 3{O_{2\left( l \right)}} \to 2A{l_2}{O_{3\left( s \right)}}$
This defensive oxide layer on aluminum is meager. It shields the metal from additional oxidation. The thickness, and properties of this oxide layer can be upgraded by the cycle called anodizing. It has high erosion perseverance and high temperature soundness, low warm development. Therefore, aluminum is more reactive than iron.

Note:
 The significant employment of strength aluminum oxides are in refractories, earthenware production, cleaning and rough applications. Huge weights of aluminum hydroxide, from which alumina is inferred, are utilized in the assembling of zeolites, covering titania colors, and as a fire retardant or smoke suppressant.