Topic 11 - Group 17

Question 1

What is the color and state of Fluorine at rtp?

Answer 1

Pale yellow gas

Question 2

What is the color and state of Chlorine at rtp?

Answer 2

Pale green gas

Question 3

What is the color and state of Bromine at rtp?

Answer 3

Brown-orange liquid

Question 4

What is the color and state of Iodine at rtp?

Answer 4

Grey solid

Question 5

Do boiling points increase or decrease down group 17?

Answer 5

Increase

Question 6

Does electronegativity increase or decrease down group 17?

Answer 6

Decrease

Question 7

Why does electronegativity decrease down group 17?

Answer 7

Increased shielding.
Atoms get larger so the distance between the nucleus and the electrons increases.

Question 8

Are hydrogen halides acidic or basic?

Answer 8

Acidic

Question 9

What is formed when hydrogen halides react with water?

Answer 9

Acids and white misty fumes.

Question 10

What forms when hydrogen halides react with ammonia gas?

Answer 10

White fumes of ammonium halides.

Question 11

Does hydrogen halide stability when heated increase or decrease down group 17?

Answer 11

Decrease

Question 12

What happens when HF and HCL are heated?

Answer 12

They are stable and don’t split into H+/F- or Cl- ions.

Question 13

What happens when HBr is heated?

Answer 13

It partially splits up.

Question 14

What happens when HI is heated?

Answer 14

It splits up easily.

Question 15

What is the chemical test for halides?

Answer 15

Silver nitrate solution and then confirm with ammonia.

Question 16

What forms when chloride ions are added to HNO3 and AgNO3?

Answer 16

White precipitate forms. (silver chloride AgCl)

Question 17

What forms when bromide ions are added to HNO3 and AgNO3?

Answer 17

Cream precipitate forms. (silver bromide AgBr)

Question 18

What forms when iodide ions are added to HNO3 and AgNO3?

Answer 18

Yellow precipitate forms. (silver iodide AgI)

Question 19

What happens when ammonia solution is added to the silver nitrate tests?

Answer 19

Cl - precipitate dissolves in dilute NH3
Br - precipitate dissolves in conc. NH3
I - precipitate is insoluble in NH3

Question 20

What is hexane used as?

Answer 20

An organic solvent.

Question 21

Why is hexane used in displacement reactions?

Answer 21

The halogen will dissolve in the hexane and a colored band will appear above the aqueous solution. Color changes are more visible.

Question 22

Does reactivity in halogens increase or decrease down group 17?

Answer 22

Decrease

Question 23

Are halogens more or less oxidising down group 17?

Answer 23

Less oxidising.

Question 24

What color is the aqueous layer when KBR reacts with chlorine water, bromine water, and iodine solution?

Answer 24

Cl2 and Br2 - yellow
I2 - brown

Question 25

What color is the aqueous layer when KCL reacts with chlorine water, bromine water, and iodine solution?

Answer 25

Cl2 - colorless Br2 - yellow I2 - brown

Question 26

What color is the aqueous layer when KI reacts with chlorine water, bromine water, and iodine solution?

Answer 26

Brown for all.

Question 27

What oxidation states can Fluorine form?

Answer 27

0 and -1

Question 28

What oxidation states can Chlorine form?

Answer 28

-1 (chloride Cl-) 0 (chlorine Cl2) +1 (chlorate (I) ClO-)

Question 29

What oxidation states can Bromine form?

Answer 29

-1 (bromide Br-) 0 (bromine Br2) +1 (bromate (I) BrO-) +3 (bromate (III) BrO2-)

Question 30

What oxidation states can Iodine form?

Answer 30

+5 (iodate (V) IO3-) +7 (iodate (VII) IO4-)

Question 31

What is disproportionation?

Answer 31

The simultaneous oxidation and reduction of X

Question 32

Are halide ions oxidising agents or reducing agents?

Answer 32

Reducing

Question 33

Does reducing power increase or decrease down the group?

Answer 33

Increase

Question 34

What are the products when H2SO4 reacts with NaX (X being a halide ion)?

Answer 34

NaHSO4 + HX

Question 35

How to remember all the sulfur and halide reactions?

Answer 35

White fumes Purple/orange vapor Yellow solid Rotten egg

Question 36

What is sodium chlorate (I) also known as?

Answer 36

Bleach

Question 37

How does chlorine kill bacteria in water?

Answer 37

It reacts to form chlorate (ClO-) ions which kill bacteria in water

Question 38

What is the full name of PVC?

Answer 38

Polyvinylchloride

Question 39

What is PVC used in?

Answer 39

Electrical coverings Window frames Guttering Plumbing pipes