Oxidation state +1 for phosphorous is found in___________?
Correct answer: C. H3PO2
- A. H3PO3
- B. H3PO4
- C. H3PO2
- D. H2P2O7
Explanation
In H3PO2, hydrogen has oxidation state +1 and oxygen has -2, so 3(+1) + P + 2(-2) = 0, giving P = +1. Students may choose H3PO3 because it is another phosphorus oxyacid, but phosphorus there has oxidation state +3.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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