Group 7, The Halogens

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Total cards: 21•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (21)

Front (Question)

A student was reacting different halide ions with silver nitrate solution and studying the precipitates formed. Why did the student not both testing fluoride ions?

Back (Answer)

Silver fluoride is soluble and so you don’t get a precipitate

Front (Question)

What colour precipitate is produced when you react silver nitrate solution with iodide ions?

Back (Answer)

Pale yellow

Front (Question)

What colour precipitate is produced when you react silver nitrate solution with chlorine ions?

Back (Answer)

White

Front (Question)

What colour precipitate is produced when you react silver nitrate solution with bromine ions?

Back (Answer)

Pale cream

Front (Question)

Give a simple ionic equation to show the reaction between silver nitrate solution and chlorine ions

Back (Answer)

Ag+(aq) + Cl-(aq) –> AgCl(s)

Front (Question)

Give a simple ionic equation to show the reaction between silver nitrate solution and bromine ions

Back (Answer)

Ag+(aq) + Br-(aq) –> AgBr(s)

Front (Question)

Give a simple ionic equation to show the reaction between silver nitrate solution and iodide ions

Back (Answer)

Ag+(aq) + I-(aq) –> AgI(s)

Front (Question)

Give the reaction of chlorine with water to form chloride and chlorate ions

Back (Answer)

Cl2 + H2O HCl + HClO (chloric acid)

Front (Question)

What type of reaction is that of chlorine with water? (ox, reduc etc)

Back (Answer)

Disproportionation

#10

Front (Question)

How could you test for the presence of chlorine?

Back (Answer)

Blue litmus turns red in the presence of chlorine (bleaches it)

#11

Front (Question)

Give the reaction of chlorine with water to form oxygen

Back (Answer)

2Cl2 + 2H2O –> 4HCl + O2

#12

Front (Question)

Give a use of chlorine in water

Back (Answer)

Forms bleach which sterilises water for swimming and drinking

#13

Front (Question)

Give a reaction to show the formation of bleach

Back (Answer)

Cl2 + 2NaOH –> NaClO (bleach) + NaCl + H2O

#14

Front (Question)

Describe and explain what you would observe if you added chlorine water to KBr

Back (Answer)

An orange solution is formed Cl has displaced Br as it is a better oxidising agent, and so oxides Br- to Br2

#15

Front (Question)

Describe and explain what you would observe if you added chlorine water to KI

Back (Answer)

A brown solution is formed Cl2 can oxidise the I- to I2

#16

Front (Question)

Describe and explain what you would observe if you added bromine water to KI

Back (Answer)

A brown solution is formed Br2 can oxidise the I- to I2

#17

Front (Question)

Give an ionic equation to show the reaction between bromine water and KI

Back (Answer)

Br2 + 2I- –> 2Br- + I2

#18

Front (Question)

What kind of reaction is shown between the reaction of chlorine water and KBr

Back (Answer)

Displacement reaction Also a redox reaction

#19

Front (Question)

What kind of reaction is shown between the reaction of chlorine water and KBr

Back (Answer)

Displacement reaction Also a redox reaction

#20

Front (Question)

Describe and explain the trend in oxidising ability down the halogen ions

Back (Answer)

Decreases as you go down Get larger - more shielding and so weakened nuclear attraction, resulting in the ion being less able to attract an electron (be reduced)

#21

Front (Question)

What type of reaction is the formation of bleach (ox/redox)?

Back (Answer)

Disproportionation