Skip to content

Ozone

Easychemistry

Ozone turns moist starch-iodide paper blue because it:

Select the correct option:

🔒 Solution Hidden from View

Submit your answer to unlock the detailed step-by-step solution.

More p-block elements Practice Questions

MediumJEE_MAIN

The O-O bond length in ozone is:

View Solution→
MediumJEE_MAIN

Silicones are synthetic polymers with a repeating silicon-oxygen backbone; which property makes them...

View Solution→
EasyJEE_MAIN

Carbon monoxide is a highly poisonous gas; on what basis does it exert its toxic effect on the human...

View Solution→
HardJEE_ADVANCED

Why does the stability of the +5 oxidation state decrease while that of the +3 state increases down ...

View Solution→
MediumJEE_MAIN

Interhalogen compounds such as ClF_3 are generally more reactive than the individual halogens; what ...

View Solution→
EasyJEE_MAIN

Chlorine acts as a bleaching agent for cotton and paper; on what chemical principle does its bleachi...

View Solution→
MediumJEE_MAIN

Why is white phosphorus far more reactive and toxic than red phosphorus despite both being allotrope...

View Solution→
MediumJEE_MAIN

Carbon shows a far greater tendency for catenation than silicon and the heavier members of Group 14;...

View Solution→
MediumJEE_MAIN

In the industrial Haber process for manufacturing ammonia, which set of conditions favours a high yi...

View Solution→
MediumJEE_MAIN

Ozone acts as a powerful oxidising agent and readily decomposes to oxygen; what makes it thermodynam...

View Solution→
EasyJEE_MAIN

Nitrogen exists as a diatomic gas with a very high bond dissociation enthalpy; what structural featu...

View Solution→
MediumJEE_MAIN

Noble gases were long thought inert, yet xenon forms compounds like XeF_2 and XeF_4; why can xenon r...

View Solution→

Browse all p-block elements questions →

About This Question

Subject
chemistry
Chapter
p-block elements
Topic
ozone
Difficulty
Easy
Year
2025
Tags
OzoneOxidizing AgentKI Test

Solution

Correct Answer:

oxidizes iodide ions to iodine

The test is based on the oxidizing nature of ozone. O3 oxidizes I- from KI to I2, and the liberated iodine forms a blue complex with starch. This color change confirms the oxidizing action of ozone on iodide ions.

This easy difficulty chemistry question is from the chapter p-block elements, covering the topic of ozone. It appeared in the 2025 exam.

Looking for more practice? Explore all chemistry questions or browse p-block elements questions on RankGuru.