Question

which of these is not a strong acid? hclo₄ hclo₃ hclo₂ hcl

Explanation:

Strong acids are those that completely dissociate in water. The strong acids among the given options are \(HClO_4\) (perchloric acid), \(HClO_3\) (chloric acid), and \(HCl\) (hydrochloric acid). \(HClO_2\) (chlorous acid) is a weak acid as it does not dissociate completely in water.

Answer:

\(HClO_2\) (chlorous acid)