The colour of the X_2 molecules of group 17 elements changes gradually from yellow to violet down the group. This is d

# Ask a Question

### Question Asked by a Student from EXXAMM.com Team

Q 2987656587.     The colour of the X_2 molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to
JEE 2017 Advanced Paper 1
A

The physical state of X_2 at room temperature changes from gas to solid down the group

B

Decrease in HOMO-LUMO gap down the group

C

Decrease in pi^(**)-pi^(**) gap down the group

D

Decrease in ionization energy down the group

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

#### Access free resources including

• 100% free video lectures with detailed notes and examples
• Previous Year Papers
• Mock Tests
• Practices question categorized in topics and 4 levels with detailed solutions
• Syllabus & Pattern Analysis