1
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 9th April Morning Slot

The electronic configuration with the highest ionization enthalpy is :
A
[Ne] 3s2 3p1
B
[Ne] 3s2 3p2
C
[Ne] 3s2 3p3
D
[Ar] 3d10 4s2 4p3

Explanation

In option (D) electron is removed from 4p subshell for 1st ionization enthalpy, but in all other options electron is removed from 3p subshell. As 3p subshell is closer to nucleus than 4p, then attraction to the electrons in 3p subshell is more compared to the electrons in 4p subhell. That is why removal of electrons from 4p subshell is easy compared to 3p subshell. So among all the options, option (D) will have least ionization enthalpy.

Among (A), (B), (C) options, (C) has half filled 3p subshell so it is more stable compare to the others and you have to provide more energy to remove electrons from stable 3p subshell. That is why electron configuration [Ne] 3s2 3p3 has highest ionization enthalpy.
2
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Morning Slot

For Na+, Mg2+, F- and O2-; the correct order of increasing ionic radii is :
A
O2- < F- < Na+ < Mg2+
B
Na+ < Mg2+ < F- < O2-
C
Mg2+ < Na+ < F- < O2-
D
Mg2+ < O2- < Na+ < F-

Explanation

Here all of them are isoelectric. For isoelectric anion size is more than cation. Among two anions which anion has more negative charge will have more radius and among two cation which cation has less positive charge will have more radius.
3
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

The correct order of electron affinity is :
A
F > Cl > O
B
F > O > Cl
C
Cl > F > O
D
O > F > Cl

Explanation

Electron affinity means tendency of gaining an electron by an atom.

In a period from left ot right the electron affinity increases and in a group it decreases from top to bottom.

So according to this theory Fluorine(F) should have most electron affinity. But when an electron is added to the F atom, electron comes to the 2p orbital and for Cl atom electron is added in 3p orbital. As 2p orbital is closer to the nucleus than 3p orbital as 3p orbital is larger in size, so when a new electron comes to 2p orbital then it will face a strong repulsion force by the nucleus than if electron comes to 3p orbital.

So, F have lesser tendency of gaining electron than Cl.

Note : In entire periodic table Cl have highest electron affinity.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to :
A
inert pair effect
B
diagonal relationship
C
lattice structure
D
lanthanoid contraction

Explanation

Electronic configuration of Thallium (Tl) is
= [Xe]4f14 5d10 6s2 6p1

Here because of poor sheilding of 4f and 5d orbital on 6s orbital, electrons of 6s orbital is more tightly held by the nucleus and perticipate less in bond formation. This is called as innert pair effect. And that is why Tl become stable in +1 oxidation state.

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