First slide

Electronic configuration and Atomic , physical properties

Question

List I (Property)                      List II(Order)
   A) M.P                               1) I2 < Br2 < F2 < Cl2
   B) B.P                          2) Cl > F > Br > I
   C) Electron affinity    3) Cl2 > Br2 > F2 > I2
   D) Bond dissociation    4) F2 > Cl2 > I2 > Br2
           energy         5) F2 < Cl2 < Br2 < I2
   The correct match is

Easy

A

A-5,B-5,C-2,D-3
B

A-2,B-5,C-3,D-4
C

A-1,B-2,C-3,D-4
D

A-5,B-2,C-3,D-4

Solution

1.The melting points and the boiling points increase from fluorine to iodine due to increase in van der Waals forces. But volatile nature decreases down the group.
2.Order of electron affinity of halogens is, Cl > F > Br > I.
3.The decreasing order of bond energies of halogens is Cl₂ > Br₂ > F₂ > I₂.

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