Test Preparation on Periodic Table & Periodicity-II-Chemistry Test Series For NEET-2020

1.

The correct order of atomic radii in group 13 elements is

1B < Al < In < Ga < Tl
2B < Al < Ga < In < Tl
3B < Ga < Al < Tl < In
4B < Ga < Al < In < Tl

In group 13 due to transition contraction [Al > Ga] .

2.

The first ionisation potentials (eV) of Be and B respectively
are

18.29eV , 9.32eV
29.32eV , 9.32eV
38.29eV , 8.29eV
49.32eV , 8.29eV

First I.P. of Be > B because of stable ns² configuration.

3.

Which of the order for ionisation energy is correct

1Be > B > C > N > O
2B < Be < C < O < N
3B < Be < C < N < O
4B < Be < N < C < O

Ionisation energy increases across the period but due to
stable half filled configuration of VA group, its I.E. is
more than VI-A group.

4.

1A
2B
3C
4D

5.

1A
2B
3C
4D

Amongst the given choices option (c) has a lowest
ionisation enthalpy because its electronic configuration
represent the bigger size and we know that ionisation
enthalpy decrease with increase of no. of orbit.


Right Ans	Wrong Ans	Not Attempted

Test Preparation on Periodic Table & Periodicity-II-Chemistry Test Series For NEET-2020

The correct order of atomic radii in group 13 elements is

The first ionisation potentials (eV) of Be and B respectivelyare

Which of the order for ionisation energy is correct

Check your progress:

The first ionisation potentials (eV) of Be and B respectively
are