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4. Assign an oxidation state to the element whose atom is underlined in the following compound: AIH3
O Al: +5
O Al: -5
Ο Ο Ο
Al: -3
O Al: +3

Respuesta :

Answer: The oxidation state of Al in [tex]AlH_{3}[/tex] is +3.

Explanation:

The number attained by an atom or substance due to loss or gain of electrons is called oxidation state.

For example, in [tex]AlH_{3}[/tex] it is known that the oxidation state of hydrogen is -1 as aluminum is a cation so it cannot have an oxidation state as 'minus'.

Whereas hydrogen has the property to act both as a cation and an anion.

Let us assume the oxidation state of Al is x in the compound [tex]AlH_{3}[/tex].

Hence, oxidation state of Al is calculated as follows.

[tex]x + 3(-1) = 0\\x - 3 = 0\\x = +3[/tex]

This means that the oxidation state of Al in [tex]AlH_{3}[/tex] is +3.

Thus, we can conclude that oxidation state of Al in [tex]AlH_{3}[/tex] is +3.

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