What are the oxidation states of phosphrous in the following?

$H_{3} P O_{3}$

$P C l_{3}$

$C a_{3} P_{2}$

$N a_{3} P O_{4}$

$P O F_{3}$

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Solution

Let the oxidation state of phosphrous be x.

(i) $H_{3} P O_{3} (3 \times + 1) + x + (3 x - 2) = 0 x = + 3$

(ii) $P C l_{3} x + (3 \times - 1) x = + 3$

(iii) $C a_{3} P_{2} (3 \times + 2) + 2 x x = - 3$

(iv) $N a_{3} P O_{4} (3 \times 1) + x + (4 x - 2) x = + 5$

(v) $P O F_{3} x + (- 2) + (3 x - 1) x = + 5$

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