Gp17- Chem Properties

Question 1

Why halogen atoms have tendency to form anions?

Answer 1

Achieve ionic octet

Question 2

Halogens are?

Answer 2

Strong OA

Question 3

Down the group, oxidising ability?

Answer 3

Decreases

-ele(-) decreases, ability to accept e decreases

Question 4

Displacement occurs if?

Answer 4

The reaction is spontaneous

Question 5

Down the gp, thermal stability?

Answer 5

Decrease

Question 6

Explain the trend of thermal stability

Answer 6

• atomic radii of X increases;
• effectiveness of overlap by H orbital and X orbital decreases;
• H-X bond weakened;
• less energy req to overcome the H-X bond;
• H-X decomposes at a lower temp:

=> more energetically favourable to decompose HI than HCl