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Valency and Oxidation State

What is the o...

Question

What is the oxidation number for As in the chemical formula for arsenic acid, $H_{3} A s O_{4}$ ?

A

1

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B

2

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C

3

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D

4

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E

5

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Solution

The correct option is D 5
Oxidation number of $A s$ in $H_{3} A s O_{4}$ :
$\Rightarrow 3 + x + (4 \times - 2) = 0$
$\Rightarrow 3 + x - 8 = 0$
$\Rightarrow x = 8 - 3$
$\Rightarrow x = + 5$ .

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