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Determine the oxidation number of phosphorus in the compound Ba(H2PO2)2.
- +3
- +2
- +1
- -1
Correct answer: +1
Solution
Ba(H2PO2)2: Ba = +2, so each H2PO2 unit has charge -1. In H2PO2⁻: 2*(+1) + x + 2*(-2) = -1 => 2 + x - 4 = -1 => x = +1. Phosphorus has oxidation number +1.
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