Group 7

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

Describe the trend in reducing abilities of halide ions

Back (Answer)

Reducing ability increases down the group

Front (Question)

Explain the trend in reducing abilities of halide ions

Back (Answer)

Reducing ability increases down the group - Ionic size increases down the group - Shielding increases - Attraction between outer electron and nucleus decreases - So electron is more easily lost

Front (Question)

What is the type of reaction between halide and concentrated H2SO4

Back (Answer)

Acid base reaction (and redox after Cl- and F-)

Front (Question)

What is the observation when Br2 is formed

Back (Answer)

Brown/orange fumes

Front (Question)

What is the observation when I2 is formed

Back (Answer)

Black solid/ Purple fumes

Front (Question)

What is the observation when SO2 is formed

Back (Answer)

Pungent gas

Front (Question)

What is the observation when S is formed

Back (Answer)

Yellow solid

Front (Question)

What is the observation when H2S is formed

Back (Answer)

Smell of bad eggs

Front (Question)

Describe the trend in electronegativity of halides

Back (Answer)

Decreases down the group

#10

Front (Question)

Explain the trend in electronegativity of halides

Back (Answer)

Decreases down the group • Atomic size increases • Shielding increases -Weaker attraction between nucleus and shared pair of e- of the covalent bond

#11

Front (Question)

State the trend in boiling point of the halides

Back (Answer)

Boiling point increases down the group

#12

Front (Question)

Explain the trend in boiling point of the halides

Back (Answer)

Boiling point increases down the group • Molecular size increases • Number of electrons increases • Van der waals forces between molecules increases • More energy required to overcome these forces

#13

Front (Question)

What is the best oxidising agent out of the halides

Back (Answer)

#14

Front (Question)

What is the worst oxidising agent out of the halides

Back (Answer)

I2 (more shielding therefore worse at gaining an electron)

#15

Front (Question)

What is the best reducing agent out of the halide ions

Back (Answer)

I-

#16

Front (Question)

What is the worst reducing agent out of the halides

Back (Answer)

F-

#17

Front (Question)

What is observed when Cl2 is formed?

Back (Answer)

Green solution

#18

Front (Question)

What are the 4 steps in testing for halide ions

Back (Answer)

1) Add HNO3 2) Add AgNO3 3) Add dilute NH3 4) Add concentrated NH3

#19

Front (Question)

Why do we add HNO3 (nitric acid) in the first step of identifying halide ions (why is silver nitrate acidified) Write an equation for this reaction

Back (Answer)

Removes Co32- ions (essential as Ag2CO3 is a white ppt) 2 HNO3 + Na2CO3 —> 2 NaNO3 + H2O + CO2 (Na is from compound like NaBr)

#20

Front (Question)

Which element is clearly identified after adding AgNO3 in the halide ion test

Back (Answer)

F- (Gives a colourless solution) (The others give white, cream and yellow)

#21

Front (Question)

Which element is clearly identified after adding DILUTE NH3 in the halide ion test. Write the equation for this reaction

Back (Answer)

Cl- (In Cl- white ppt dissolves, Br- and I- have no visible change) AgCl(s) + 2NH3(aq) ⇌ [Ag(NH3)2]+(aq) + Cl- (aq)

#22

Front (Question)

Which element is clearly identified after adding CONCENTRATED NH3 in the halide ion test. Write the equation for this reaction

Back (Answer)

Br- (In Br- cream ppt dissolves, I- has no visible change) AgBr(s) + 2NH3(aq) ⇌ [Ag(NH3)2]+ (aq) + Br - (aq)

#23

Front (Question)

What is the test for I- ions

Back (Answer)

No visible change after completing all 4 steps of halide ion test

#24

Front (Question)

What is the formula for the chlorate ion

Back (Answer)

ClO-