2HBr + H2SO4 → Br2 + SO4 + H2O
2HI + H2SO4 → I2 + SO4 + H2O
8HI + H2SO4 → 4I2 + 4H2O + H2S
Concentrated sulphuric acid
First reaction = acid base
Halide acting as reducing agent because they are losing an electron
Reducing power increases down the group due to increasing ion size. Electrons further away, more shielding, less energy to lose. Also H-X bond weakens.
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