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Q.

What is the oxidation number of $P$ in product when ${POCl}_{3}$ is completely hydrolysed?

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a

$+ 5$

b

$+ 4$

c

$+ 3$

d

$+ 2$

answer is A.

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Detailed Solution

$P O C l_{3} = x + (- 2) + 3 (- 1) = 0, x = + 5$ Oxygen has an oxidation state of -2 and hydrogen has a +1.

${POCl}_{3} + 3 H_{2} O ⟶ H_{3} {PO}_{4}$

So, oxidation state of P = +5

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