1

### JEE Main 2019 (Online) 11th January Morning Slot

The correct order of the atomic radii of C, Cs, Al, and S is :
A
S < C < Al < Cs
B
S < C < Cs < Al
C
C < S < Al < Cs
D
C < S < Cs < Al

## Explanation

Atomic radii increase by moving down the group and decrease across a period.

Hence, the correct order of atomic radii is : C < S < Al < Cs.
2

### JEE Main 2019 (Online) 11th January Evening Slot

The correct option with respect to the Pauling electronegativity values of the element is :
A
Ga < Ge
B
Si < Al
C
Te > Se
D
P > S

## Explanation

Electronegativity increases from left to right in a period and decreases down the group. The correct orders are

Si > Al, Ga < Ge, Te < Se and P < S.
3

### JEE Main 2019 (Online) 11th January Evening Slot

The relative stability of +1 oxidation state of group 13 elements follows the order :
A
Tl < In < Ga < Al
B
Al < Ga < TI < In
C
AI < Ga < In < TI
D
Ga < AI < In < TI

## Explanation

Inert pair effect gradually increases down the group. Hence, stability of lower oxidation state increases down the group.

$\therefore$ AI < Ga < In < TI
4

### JEE Main 2019 (Online) 12th January Morning Slot

The element with Z = 120 (not yet discovered) will be an/a -
A
Alkaline earth metal
B
Alkali metal
C
Transition metal
D
Inner transition metal

## Explanation

Electronic configuration of element Og (118) is
[Rn] 5f146d 107s 27p6, where Og is oganesson.

[Og118] 8s2 is configuration for Z = 120,

As per the configuration it is in IInd group. Thus, element with Z = 120 will be an alkaline earth metal.