A Levels Chemistry (9701)•9701/13/M/J/24

Explanation
Redox analysis of ICl hydrolysis Steps:
- In ICl, Cl (more electronegative) is -1, so I is +1.
- Products: HIO3 has I +5 (H +1, 3O -6); I2 has I 0; HCl has Cl -1.
- Some I oxidized (+1 to +5) forming HIO3 (written as HOI); some reduced (+1 to 0) forming I2.
- Cl unchanged at -1; no reduction.
Why B is correct:
- Reduction decreases oxidation number; Cl remains -1 in ICl and HCl, violating the definition.
Why the others are wrong:
- A: Correctly states I (+1) oxidized to oxyiodine product, so not the wrong statement.
- C: I initial state is +1, not -1; false premise makes it invalid choice.
- D: Same as C; incorrect initial state for I.
Final answer: B
Topic: Group 17
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