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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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. Although aluminum is one of the most abundant metals on earth, its price until the 1890s made it a precious metal” like gold and platinum. Why?

Interpretation Introduction

Interpretation:

The corrosion resistant nature of aluminium should be explained.

Concept Introduction:

The oxidation and reduction can be identified by change in oxidation state. If oxidation state of atom of an element increases, it undergoes oxidation and if it decreases, it undergoes reduction.

The general oxidation and reduction half reactions are as follows:

AsA+aq+e

Here, As undergoes oxidation to form A+aq with release of 1 electron. The oxidation state of A increases from 0 to 1.

Similarly,

B+aq+eBs

Here, B+aq undergoes reduction to form Bs with addition of 1 electron. The oxidation state of A decreases from 1 to 0.

Explanation

Because due to immediate formed protected layer of aluminium oxide aluminium is corrosion resistant and termed as precious metal like gold and platinum.

On exposure to atmosphere, the surface of aluminium forms a thin layer of aluminium oxide which is invisible. The aluminium has self protecting characteristic which makes it highly resistance to corrosion...

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