Explain the bleaching property of ozone.

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Q. Explain the bleaching property of ozone.

Bihar BsebBihar Board Intermediate 2022Subjective· 2mImportance★★★★★

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Ozone is a strong oxidiser; it decomposes to O2 + nascent oxygen [O], and this atomic oxygen oxidises coloured substances to colourless ones — that is its bleaching action.

Bleaching property of ozone:

Ozone (O3) is a very powerful oxidising agent.
It is unstable and readily breaks down to give ordinary oxygen and nascent (atomic) oxygen: O3 → O2 + [O]
The nascent oxygen so produced is highly reactive. It oxidises the coloured (dye/pigment) material, destroying the groups responsible for colour, and converts it into a colourless substance.
Thus ozone acts as a bleaching agent by oxidation (this is called oxidative bleaching).

Uses/examples: …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2026Set A1 markMCQ
$Q. Which of the following is formed by the reaction of Hg with ozone ?$
(a) HgO
(b) HgO2
(c) Hg2O
(d) None of these
›Reveal solutionSolution

Ozone oxidises mercury to HgO, causing the classic 'tailing of mercury'.

Ozone is a powerful oxidising agent. It oxidises mercury to mercuric oxide:

2 Hg + 2 O3 -> 2 HgO + 2 O2 (i.e. Hg + O3 -> HgO + O2)

…

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CBSE 2025Set ANNUAL1 markMCQ
$Q. Ozone layer is depleted by _____.$
(a) NO
(b) NO $_2$
(c) NO $_3$
(d) N $_2$ O $_5$
›Reveal solutionSolution

NO catalytically depletes ozone: $NO+O_3\rightarrow NO_2+O_2$ , then $NO_2+O\rightarrow NO+O_2$ (NO regenerated).

Nitric oxide (NO) reaching the stratosphere (from supersonic aircraft exhaust, or naturally from $N_2O$ ) catalytically destroys ozone in a chain cycle:

$NO + O_3 \longrightarrow NO_2 + O_2$

$NO_2 + O \longrightarrow NO + O_2$

…

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CBSE 2023Set ANNUAL1 mark
$O_3$
›Reveal solutionSolution

$O_3$ decomposes to release highly reactive nascent oxygen, making it a strong oxidising agent.

Ozone is thermodynamically unstable and readily decomposes: $O_3 \rightarrow O_2 + [O]$ (nascent/atomic oxygen). This nascent oxygen atom is extremely reactive and readily oxidises other substances, accepting electrons easily. Because one of the three oxygen atoms is very loosely bound and is easily given up as nascent oxygen, ozone acts as a powerful oxidising agent, e.g. it oxidises mo …

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Q.Explain the bleaching property of ozone.

Concept understanding — Ozone

Q.Explain the bleaching property of ozone.

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