An element (X) exists in allotropic forms; one allotrope glows in the dark and is a white waxy solid. Find the number of oxyacids of element X, out of the following, which contain at least one X-X linkage :
H₄P₂O₆, H₄P₂O₅, H₄P₂O₇, (HPO₃)ₙ, H₃PO₃, H₄P₂O₈

Question

An element (X) exists in allotropic forms; one allotrope glows in the dark and is a white waxy solid. Find the number of oxyacids of element X, out of the following, which contain at least one X-X linkage :

H₄P₂O₆, H₄P₂O₅, H₄P₂O₇, (HPO₃)ₙ, H₃PO₃, H₄P₂O₈

TestHub · Accepted Answer

X = phosphorus (white P glows, waxy). P-P linkages exist in hypophosphoric acid H₄P₂O₆ and pyrophosphorous acid H₄P₂O₅. H₄P₂O₇ has a P-O-P linkage, H₄P₂O₈ a P-O-O-P linkage; the rest are monomeric. Count = 2.

Chemistry - Complete P-block Question with Solution | TestHub

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