Chemistry - Complete Pblock- Question with Solution | TestHub

An X–O–X linkage means a bridging oxygen atom is present between two atoms of the same element.

Na₂B₄O₇·10H₂O (Borax) → contains B–O–B linkage

S₃O₉, H₃P₃O₉, Na₃B₃O₆, N₂O₅, P₄O₇→ contain S–O–S / P–O–P / B–O–B / N–O–N linkages

Na₂S₄O₆ has S–S bonds but no S–O–S linkage

H₂N₂O₂ (hyponitrous acid) has N–N and N–O bonds, but no N–O–N linkage

Therefore, the total number of compounds containing X–O–X linkage = 6.