Question

The conjugate base of $HCI{O}_4$ is weaker base than $H_{2}O$

• A. $HCI{O}_4$ is more acidic than $HCIO$ because of the resonance stabilization of its anion
• B. The central atom in both $HCI{O}_4$ and $HCIO$ is $s{p}^3$ hybridized
• C. $HCI{O}_4$ is formed in the reaction between $C{l}_2$ and $H_{2}O$
• D. The conjugate base of $HCI{O}_4$ is weaker base than $H_{2}O$

Answer 1

Answer: (A), (B), (D)

The conjugate base of $HCI{O}_4$ is weaker base than $H_{2}O$

(1) $HCl{O}_4>H_{2}O$ Acidic character
$Cl{O}_4^{-}<O{H}^{-}$ Conjugate Base
Strong acids have weak conjugate base

(2) Both $HCI{O}_4$ and $HClO$ central atom is $s{p}^3$ hybridised

(4) $HCl{O}_4>HClO$ Acidic strength

$HCl{O}_4\to H^{+}+Cl{O}_4^{-}$
$HClO\to H^{+}+Cl{O}^{-}$

In $Cl{O}_4^{-},$ negative charge is dispersed on four oxygen, so better resonance stabilised.