Last updated on Oct 23, 2026

Chemical Properties of Group 7 (AQA A-Level Chemistry): Flashcards

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Chemical Properties of Group 7

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Observation: NaCl + conc. $H_2SO_4$

Misty white fumes (HCl)

Reaction type: NaCl/NaF + $H_2SO_4$

Acid-base (not redox)

Observation: NaBr + $H_2SO_4$ (2nd reaction)

Red-brown $Br_2$ vapour

Type: NaBr + $H_2SO_4$ (2nd reaction)

Redox reaction

Br oxidation state: NaBr + $H_2SO_4$

$-1$ to $0$ (HBr to $Br_2$ )

S oxidation state: NaBr + $H_2SO_4$

$+6$ to $+4$ ( $H_2SO_4$ to $SO_2$ )

Purple vapour in NaI + $H_2SO_4$

Iodine ( $I_2$ ) vapour

Yellow solid in NaI + $H_2SO_4$

Sulfur (S)

Rotten egg smell in NaI + $H_2SO_4$

Hydrogen sulfide ( $H_2S$ )

Reducing strength: $I^-$ vs $Br^-$

$I^-$ much stronger reducing agent

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Periodicity

Group 2, the Alkaline Earth Metals

Group 7 (17), the Halogens

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Periodicity

Group 2, the Alkaline Earth Metals

Group 7 (17), the Halogens

Explore AQA A-Level Chemistry Quizzes by Topics

Periodicity

Group 2, the Alkaline Earth Metals

Group 7 (17), the Halogens

Explore AQA A-Level Chemistry Exam Questions by Topics

Periodicity

Group 2, the Alkaline Earth Metals

Group 7 (17), the Halogens

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