Halogens

Question 1

Atomic radius for group 7

Answer 1

Increases down

Question 2

Reactivity down gp 7

Answer 2

Decreases down as larger atomic radius so weaker attraction between neg electrons

Question 3

Bp down group

Answer 3

Higher down group
As more electrons
So stronger VDW forces

Question 4

Oxidising power down

Answer 4

Ability to accept electrons decreases as weaker attraction
Cl2 displaces Br- and I-
Br2 displaces I-
i2 doesn’t displace any halide

Question 5

Halide ions reducing

Answer 5

Increases down group
As electrons easier to lose from larger atoms

Question 6

NaF + H2SO4

Answer 6

NaHSO4 + HF

Question 7

NaCl + H2SO4

Answer 7

NaHSO4 + HCl

Question 8

NaBr + H2SO4

Answer 8

NaHSO4 + HBr

Question 9

2HBr + H2SO4

Answer 9

Br2 + SO2 + 2H2O

Question 10

NaI + H2SO4

Answer 10

NaH2SO4 + HI

Question 11

2HI + H2SO4

Answer 11

I2 + SO2 + 2H2O

Question 12

6Hi + SO2

Answer 12

H2S + 3I2 + 2H2O

Question 13

Black solid produced

Answer 13

Means I2 produces

Question 14

Yellow solid produced

Answer 14

Sulfur solid

Question 15

Test for halide ions

Answer 15

Add acidified AgNO3
Then test with NH3

Question 16

AgNO3 + Cl-

Answer 16

White ppt

Question 17

Cl-