Question:
Ozone when reacts with potassium iodide solution liberates a substance which turns starch paper blue. The liberated substance is:
Ozone when reacts with potassium iodide solution liberates a substance which turns starch paper blue. The liberated substance is:
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Starch test: Iodine gives blue color — very common exam test.
Updated On: Apr 15, 2026
- oxygen
- iodine
- hydrogen iodide
- potassium hydroxide
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Ozone (\(O_3\)) is a strong oxidizing agent.
Step 1: Reaction. \[ O_3 + 2KI + H_2O \rightarrow I_2 + 2KOH + O_2 \]
Step 2: Observation. \[ I_2 + \text{starch} \rightarrow \text{blue complex} \]
Step 3: Conclusion. Liberated iodine turns starch paper blue.
Step 1: Reaction. \[ O_3 + 2KI + H_2O \rightarrow I_2 + 2KOH + O_2 \]
Step 2: Observation. \[ I_2 + \text{starch} \rightarrow \text{blue complex} \]
Step 3: Conclusion. Liberated iodine turns starch paper blue.
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