Which of the following acids is not levelled in its aqueous solution?

A
$HCl$
B
$H_{2} {SO}_{4}$
C
${HClO}_{4}$
D
$H_{3} {PO}_{4}$

Solution:

An acid weaker than H₃O⁺ is not levelled.

In accordance with Arrhenius, bases are hydroxide compounds that yield ${OH}^{-}$ ions upon dissociation in water, while acids are hydrogen-containing compounds that give $H^{+}$ ions or protons.

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