What is the oxidation number of underlined element?

$B a (H_{2} P - - O_{2})_{2}$

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Solution

Let $x$ be the oxidation number of P in $B a (H_{2} P - - O_{2})_{2}$ .
Since the overall charge on the compound is $0$ , the sum of oxidation states of all elements in it should be equal to $0$ .
Therefore, $2 + 2 (2 (1) + x + 2 (- 2)) = 0$
or, $x = + 1$
Hence, the oxidation number of P in $B a (H_{2} P - - O_{2})_{2}$ is $+ 1$ .

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