В каких соединениях фосфор пятивалентен?
1) HPO₃; 2) PCl₃; 3) P₄; 4) P₂O₅.

HPO₃ (1+5−3·2=0 ✓, P(V)) и P₂O₅ (P(V)). PCl₃ — P(III), P₄ — P(0).

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