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Q.

In which one of the following reactions, ozone acts as a reducing agent?

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a

2KI + O3 + H2O→ 2KOH + I2 + O2

b

BaO2 + O3→ BaO + 2O2

c

PbS + 4O3→ PbSO4 + O2

d

2HCl + O3 →H2O + O2

answer is A.

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Detailed Solution

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+4                        +2
BaO2​+O3​⟶BaO+2O2​
The oxidation state of Ba in the above reaction changes from +4 to +2. Hence, Ba is being reduced by O3​. So. in the above reaction, O3​ acts as a reducing  agent

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