In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

Question

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it? (A) HF < HCl < HBr < HI: Increasing acidic strength (B) H 2 O < H 2 S < H 2 Se < H 2 Te: Increasing pKa values (C) NH 3< PH 3 < AsH 3< SbH 3: Increasing acidic character (D) CO 2< SiO 2 < SnO 2< PbO 2: Increasing oxidizing power

Tardigrade Admin · Accepted Answer

From H 2 O to H 2 Te as X - H bond enthalpy decreases, acidic strength increases ( K a increases) ∴ H 2 O < H 2 S < H 2 Se < H 2 text Te....K K a H 2 O > H 2 S > H 2 Se > H 2 text Te....P K a

Q. In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

$H F < H Cl < H B r < H I$ : Increasing acidic strength

$H_{2} O < H_{2} S < H_{2} S e < H_{2} T e$ : Increasing $p K_{a}$ values

$N H_{3} < P H_{3} < A s H_{3} < S b H_{3}$ : Increasing acidic character

$C O_{2} < S i O_{2} < S n O_{2} < P b O_{2}$ : Increasing oxidizing power

From $H_{2} O$ to $H_{2}$ Te as $X - H$ bond enthalpy decreases, acidic strength increases ( $K_{a}$ increases)
$∴ H_{2} O < H_{2} S < H_{2} S e < H_{2} Te....K K_{a}$
$H_{2} O > H_{2} S > H_{2} S e > H_{2} Te....P^{K_{a}}$

Q. In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

HF<HCl<HBr<HI : Increasing acidic strength

H2​O<H2​S<H2​Se<H2​Te : Increasing pKa​ values

NH3​<PH3​<AsH3​<SbH3​ : Increasing acidic character

CO2​<SiO2​<SnO2​<PbO2​ : Increasing oxidizing power

From H2​O to H2​ Te as X−H bond enthalpy decreases, acidic strength increases ( Ka​ increases) ∴H2​O<H2​S<H2​Se<H2​ Te....K Ka​ H2​O>H2​S>H2​Se>H2​ Te....P Ka​

$H F < H Cl < H B r < H I$ : Increasing acidic strength

$H_{2} O < H_{2} S < H_{2} S e < H_{2} T e$ : Increasing $p K_{a}$ values

$N H_{3} < P H_{3} < A s H_{3} < S b H_{3}$ : Increasing acidic character

$C O_{2} < S i O_{2} < S n O_{2} < P b O_{2}$ : Increasing oxidizing power

From $H_{2} O$ to $H_{2}$ Te as $X - H$ bond enthalpy decreases, acidic strength increases ( $K_{a}$ increases)
$∴ H_{2} O < H_{2} S < H_{2} S e < H_{2} Te....K K_{a}$
$H_{2} O > H_{2} S > H_{2} S e > H_{2} Te....P^{K_{a}}$