Halogens

Question 1

Trend in reactivity down group?

Answer 1

Less reactive down group as atoms are bigger and outer electrons are more shielded. Harder to attract electrons

Question 2

Trend in mp and bp?

Answer 2

Increase down group as there’s an increase in electron shells so increased London forces

Question 3

Trend in electro negativity?

Answer 3

Decreases down group

Question 4

What ions will Cl2 displace?

Answer 4

Br- ions and I- ions

Question 5

What ions will Br2 displace?

Answer 5

I- ions

Question 6

If bromide is displaced what colour will the reaction mixture be?

Answer 6

Orange

Question 7

If iodine is displaced what colour will the reaction mixture be?

Answer 7

Brown

Question 8

I2 + cold alkali (2NaOH) =

Answer 8

NaOI + NaI + h2o

Question 9

3Cl2 + hot alkali (6NaOH) =

Answer 9

NaClO3 + 5NaCl + 3h2o

Question 10

Chlorine + NaOH =

Answer 10

NaClO + NaCl + h2o

Question 11

Trend in reducing power of halides?

Answer 11

Reducing power increases down the group as the ions get bigger so there’s increased shielding

Question 12

F- + AgNO3 =

Answer 12

No ppt formed as AgF is soluble

Question 13

Cl- ppt colour?

Answer 13

White ppt

Question 14

Br- ppt colour?

Answer 14

Cream

Question 15

I- ppt colour?

Answer 15

Yellow ppt

Question 16

What concentration of ammonia does AgCl dissolve in?

Answer 16

Dilute ammonia & conc

Question 17

What conc of ammonia does AgBr dissolve in?

Answer 17

Concentrated only.

Question 18

What conc of ammonia does AgI dissolve in?

Answer 18

Doesn’t dissolve in ammonia

Question 19

Hydrogen halides dissolve in water to produce?

Answer 19

Acidic gases

Question 20

Hydrogen halides react with ammonia to give?

Answer 20

White fumes of NH4Cl / NH4Br / NH4I