Year: 2021
Topic: Classification of Elements and Periodicity in Properties
Time :
1.
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it ?
(1). HF < HCl < HBr < HI : Increasing acidic strength
(2). H
2
O < H
2
S < H
2
Se < H
2
Te : Increasing pK
a
values
(3). NH
3
< PH
3
< AsH
3
< SbH
3
: Increasing acidic character
(4). CO
2
< SiO
2
< SnO
2
< PbP
2
: Increasing oxidizing power