Question

The colour of the X₂ molecules of group 17 elements changes gradually from yellow to violet down the
group. This is due to
[A] the physical state of X₂ at atom temperature changes from gas to solid down the group
[B] decrease in HOMO-LUMO gap down the group
[C] decrease in ????*-????* gap down the group
[D] decrease in ionization energy down the group

Answer 1

Answer:

The colour of the X2 molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to (B) Decrease in π∗ - σ∗ ........

Answer 2

Answer:The colour of the X  

2

​  

 molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to  (B) Decrease in π  

∗

−σ  

∗

 gap down the group and (C) decrease in HOMO−LUMO gap down the group. Halogens absorb visible light and appear coloured. Outer electrons are excited to higher energy level. Smaller halogen has higher excitation energy and vice versa.

so the answer is option c

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