Chemistry oxidized and reduced substances

Question

Use the following equation to answer Questions 12 and 13. ClO 3 ^ - (aq)+5Cl^ - (aq)+6H^ + (aq) 3Cl 2 (g)+3H 2 O(l) 12. The oxidized and reduced substances are, respectively , A Cl^ - (aq) and ClO 3 ^ - (aq) B) ClO 3 ^ - (aq) and Cl^ - (aq) C) ClO 3 ^ - (aq) and H^ + (aq) D ) Cl^ - (aq) and H^ + (aq)

Answer 1

ClO3^-(aq) + 5Cl^-(aq) + 6H^+ ---> 3Cl2(g) + 3H2O(l)

In the given reaction oxidation number of Cl in ClO3^- is +5 while oxidation number of Cl in Cl^- is -1.

Oxidation number of Cl in Cl2 is 0.

Incase of oxidation oxidation number increases while in reduction oxidation number decreases.

In case of ClO3^- oxidation number of Cl decreases from +5 to 0 and in Cl^- it increases from - 1 to 0.

Thus,

ClO3- is reduced and Cl^- is oxidized.

Thus, option (A) Cl^-(aq) and ClO3^-(aq) is the correct answer.