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Question:

The correct statement(s) about the oxoacids, HClO4 and HClO, is(are): the central atom in both HClO4 and HClO is sp3 hybridized; the conjugate base of HClO4 is a weaker base than H2O; HClO4 is formed in the reaction between Cl2 and H2O; HClO4 is more acidic than HClO because of the resonance stabilization of its anion.

HClO4 is more acidic than HClO because of the resonance stabilization of its anion

the central atom in both HClO4 and HClO is sp3 hybridized

HClO4 is formed in the reaction between Cl2 and H2O

the conjugate base of HClO4 is a weaker base than H2O

Solution:

The correct options are: A, B, and D.

The central atom in both HClO4 and HClO is sp3 hybridized.
The conjugate base of HClO4 is a weaker base than H2O.
HClO4 is more acidic than HClO because of the resonance stabilization of its anion.