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The colour of the X(2) molecules of grou...

The colour of the `X_(2)` molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to

A

decreases in `pi **-sigma**` gap down the group

B

decrease in ionisation energy down the group

C

the physical state of `X_(2)` at room temperature changes from gas to solid down the group

D

decreases in `HOMO-LUMO` gap down the group

Text Solution

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The correct Answer is:
B, C
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