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P Block Elements question

2017 · Shift 1 · Q1
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P Block Elements question

2017 · Shift 1 · Q1

JEE AdvancedChemistryP Block ElementsMultiple correct+4 / −1
The color of the X2{X_2}X2​ molecules of group 171717 elements changes gradually from yellow to violet down the group. This is due to
  1. A
    The physical state of X2{X_2}X2​ at room temperature changes from gas to solid down the group
  2. B
    Decrease in ionization energy down the group
  3. C
    Decrease in π∗−σ∗{\pi ^ * } - {\sigma ^ * }π∗−σ∗ gap down the group
  4. D
    Decrease in HOMO-LUMO gap down the group
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