In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it? [2021]

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Compound	${pK}_{a}$
$H_{2} O$	14
$H_{2} S$	7
$H_{2} Se$	3.872
$H_{2} Te$	2.6

Solution

Q.
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it [2021]

1 ${CO}_{2} < {SiO}_{2} < {SnO}_{2} < {PbO}_{2}$ : Increasing oxidizing power

2 $HF < HCl < HBr < HI$ : Increasing acidic strength

3 $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te$ : Increasing $p K_{a}$ values

4 ${NH}_{3} < {PH}_{3} < {AsH}_{3} < {SbH}_{3}$ : Increasing acidic character

Ans.
(3)

Compound ${pK}_{a}$

$H_{2} O$ 14

$H_{2} S$ 7

$H_{2} Se$ 3.872

$H_{2} Te$ 2.6

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Solution

Q. In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it [2021]

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

2 HF<HCl<HBr<HI : Increasing acidic strength

3 H2O<H2S<H2Se<H2Te : Increasing pKa values

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

Ans. (3) Compound pKa H2O 14 H2S 7 H2Se 3.872 H2Te 2.6

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Q.
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it [2021]

1 ${CO}_{2} < {SiO}_{2} < {SnO}_{2} < {PbO}_{2}$ : Increasing oxidizing power

2 $HF < HCl < HBr < HI$ : Increasing acidic strength

3 $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te$ : Increasing $p K_{a}$ values

4 ${NH}_{3} < {PH}_{3} < {AsH}_{3} < {SbH}_{3}$ : Increasing acidic character

Ans.
(3)

Compound ${pK}_{a}$

$H_{2} O$ 14

$H_{2} S$ 7

$H_{2} Se$ 3.872

$H_{2} Te$ 2.6