Each oxyacid contains at least one unit

CHEMISTRY · Single correct

Problem

Each oxyacid contains at least one

X\text{-}OH

unit, where

X

is a non-metal. The hydrogen atom of an

X\text{-}OH

unit is ionisable, and the number of

\text{-}OH

groups directly attached to the non-metal determines the basicity of the oxyacid. Which of the following oxyacids does not have a peroxy form with two central atoms? (1)

\mathrm{H}_2\mathrm{SO}_4

(2)

\mathrm{HNO}_3

(3)

\mathrm{H}_3\mathrm{PO}_4

(4) None

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