Group 7

Question 1

Spectator ions?

Answer 1

oxidation state of element doesn’t change and just spectates the redox reaction

Question 2

Disproportionation

Answer 2

Redox reactions where oxidation state of an element both increase and decreases so both oxidation and reduction occurs

Question 3

Test for halide ions( group 7 ions )

Answer 3

•Add acidified silver nitrate
• precipitate will be formed
•silver chloride-white ppt
•silver bromide-cream ppt
•silver iodide-yellow ppt

Question 4

Further test for group 7 ions

Answer 4

•Add ammonia solution
•Silver chloride-dissolves in dilute ammonia
•Silver bromide-dissolves in concentrated ammonia
•Silver iodide-doesn’t dissolve in concentrated ammonia

Question 5

Reaction of Chlorine with bromide ions

Answer 5

Orange solution

Question 6

Reaction of Chlorine and Iodide or Bromine and iodide

Answer 6

Brown solution

Question 7

what is observed when chloride reacts with H2S04

Answer 7

Misty white fumes from HCl

Question 8

what is observed when chloride reacts with H2S04

Answer 8

Mistru white fumes from HCl

Question 9

Bromide reaction with H2S04 forms? and what observation is made

Answer 9

•S02
•Br2 which gives off brown fumes

Question 10

Iodide reaction with H2S04 forms? and what observation is made?

Answer 10

•H2S
•Iodine (I2) which is a black solid

Question 11

Test for ammonium

Answer 11

Warm with Na0H
damp red litmus paper turns blue