What is the oxidation state of As in $\mathrm{H}_{3} \mathrm{AsO}_{4}$ ?

What is the oxidation state of As in $\mathrm{H}_{3} \mathrm{AsO}_{4}$ ?
  1. +3
  2. +5
  3. -3
  4. -1

Solution

$\mathrm{H}_{3} \mathrm{AsO}_{4} \rightarrow(1 \times 3)+(\mathrm{x})+[4 \times(-2)]=3+\mathrm{x}-8$ $\therefore x=8-3=+5$ $\therefore$ Oxidation state of $\mathrm{As}$ in $\mathrm{H}_{3} \mathrm{AsO}_{4}=+5$

Asked in: MHT CET 2020 (13 Oct Shift 2)

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