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  4. The oxidation number of phosphorus in Ba(H2PO2 )2 is

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Q. The oxidation number of phosphorus in $Ba(H_2PO_2 )_2$ is

IIT JEEIIT JEE 1988Some Basic Concepts of Chemistry

Solution:

Let the oxidation state of phosphorus in $Ba \left( H _2 PO _2\right)_2$ be $x$.
Then, the sum of all oxidation states should be 0 , since, overall charge on the compound is 0 .
Therefore, $+2+4+2 x -8=0$
or, $x=+1$
Hence, the oxidation number of phosphorus $=+1$.