b) Chlorine reacts with aqueous potassium iodide in a displacement reaction.Cl2 (aq) + 2I– (aq) 2Cl – (aq) + I2 (aq)(i) Explain, in terms of electrons, why chlorine is an oxidising agent in this reaction................................................................................................................................................................................................................................................................................. [1](ii) State the oxidation number of iodine in I2 .
Question
b) Chlorine reacts with aqueous potassium iodide in a displacement reaction.Cl2 (aq) + 2I– (aq) 2Cl – (aq) + I2 (aq)(i) Explain, in terms of electrons, why chlorine is an oxidising agent in this reaction................................................................................................................................................................................................................................................................................. 1 State the oxidation number of iodine in I2 .
Solution
(i) Chlorine is an oxidising agent in this reaction because it gains electrons. In the reaction, each chlorine atom gains an electron from an iodide ion (I-) to become a chloride ion (Cl-). This is a reduction process, and any species that causes another to be reduced (by itself gaining electrons) is an oxidising agent.
(ii) The oxidation number of iodine in I2 is 0. This is because it is in its elemental form, and the oxidation state of any element in its uncombined, elemental state is always zero.
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