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  4. Benzenediazonium chloride is reduced to benzene using hypophosphorous acid (H3 (PO)2) . The change in oxidation number of phosphorus is P1 + arrow Px + The value of x is.

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Q. Benzenediazonium chloride is reduced to benzene using hypophosphorous acid $\left(H_{3} \left(PO\right)_{2}\right)$ . The change in oxidation number of phosphorus is $P^{1 +} \rightarrow P^{x +}$
The value of $x$ is______.

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