4. Group 7

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

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Front (Question)

Reducing strength of halides:

Back (Answer)

• increases gown the group • shielding increases • weaker attraction between nucleus and outer e-

Front (Question)

Observation for SO2 (g)

Back (Answer)

Acidic gas

Front (Question)

Observation for S (s)

Back (Answer)

yellow ppt

Front (Question)

Observation for H2S (g)

Back (Answer)

bad egg smell

Front (Question)

Reduction Half Equation for SO2 from HS2O4

Back (Answer)

2e- + 2H+ + H2SO4 → SO2 + H2O

Front (Question)

Reduction Half Equation for S from H2SO4

Back (Answer)

6e- + 6H+ + H2SO4 → S + 4H2O

Front (Question)

Reduction Half Equation for H2S from H2SO4

Back (Answer)

8e- + 8H+ + H2SO4 → H2S +4H2O

Front (Question)

Reducing Agent for reduction of H2SO4 to SO2

Back (Answer)

Br-, I-

Front (Question)

Reducing Agent for reduction of H2SO4 to S

Back (Answer)

I-

#10

Front (Question)

Reducing Agent for reduction of H2SO4 to H2S

Back (Answer)

I-

#11

Front (Question)

Role of H2SO4 in the reduction of H2SO4 to SO2/S/H2S

Back (Answer)

oxidising agent

#12

Front (Question)

Acid-Based Reaction Reaction of H2SO4 with NaF

Back (Answer)

H2SO4 + NaF → NaHSO4 + HF (simplest: H+ + F- → HF)

#13

Front (Question)

Reaction of H2SO4 with NaCl

Back (Answer)

H2SO4 + NaF → NaHSO4 + HCl (simplest: H+ + F- → HCl)

#14

Front (Question)

What is H2SO4 acting as in its reaction with NaF and Cl-?

Back (Answer)

an acid

#15

Front (Question)

What are Cl- and F- acting as in their reactions with H2SO4?

Back (Answer)

a base

#16

Front (Question)

Oxidation half equation for the production of I2

Back (Answer)

2I- → I2 + 2e-

#17

Front (Question)

Oxidation half equation for the production of Br2

Back (Answer)

2Br- → Br2 + 2e-

#18

Front (Question)

Test for halides

Back (Answer)

AgNO3

#19

Front (Question)

Observations for halide tests when only AgNO3 has beeen added

Back (Answer)

AgCl(S) = white ppt AgBr(s) = cream ppt AgI(s) = yellow ppt

#20

Front (Question)

Equations for halide tests when only AgNO3 has been added

Back (Answer)

Ag+ (aq) + Cl- (aq) → AgCl (s) Ag+ (aq) + Br- (aq) → AgBr (s) Ag+ (aq) + I- (aq) → AgI (s)

#21

Front (Question)

Why do you add HNO3 before adding AgNO3 when testing for halides?

Back (Answer)

to remove any possible carbonate impurities which would result in a false positive

#22

Front (Question)

To further differentiate between the samples, what should you add?

Back (Answer)

Dilute and concentrated NH3

#23

Front (Question)

Equation for halide test when dilute NH3 has been added to AgCl(s)

Back (Answer)

AgCl (s) + 2NH3 → [Ag(NH3)2]+ (aq) + Cl-

#24

Front (Question)

Equation for halide test when dilute NH3 has been added to AgBr(s)

Back (Answer)

AgBr (s) + 2NH3 → [Ag(NH3)2]+ (aq) + Br-