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What is the oxidation number of As in $\mathrm{H}_{3} \mathrm{AsO}_{3}$ ?
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Verified Answer
The correct answer is:
+3
(D)
$\begin{aligned} \mathrm{H}_{3} \mathrm{AsO}_{3} &=(1 \times 3)+\mathrm{As}+[(-2) \times 3] \\ &=3+\mathrm{As}-6 \end{aligned}$
$\therefore \quad \mathrm{As}=+3$
$\begin{aligned} \mathrm{H}_{3} \mathrm{AsO}_{3} &=(1 \times 3)+\mathrm{As}+[(-2) \times 3] \\ &=3+\mathrm{As}-6 \end{aligned}$
$\therefore \quad \mathrm{As}=+3$
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