How will you prepare the following (Write with conditions and equation): (i) O3 from O2 (ii) Cl2 from HCl. (2.

Question 48 of 66

Q. How will you prepare the following (Write with conditions and equation):

(i) O3 from O2

(ii) Cl2 from HCl. (2.5+2.5) OR

(i) Compare the bleaching property of Cl2 and SO2.

(2)

(ii) What happens when (only equation) --

(a) NH4OH solution is added in excess to CuSO4 solution?

(b) Ozone gas is passed through H2SO4 and KI solution?

West Bengal WbchseWest Bengal HS (WBCHSE) Board 2022Subjective· 5mImportance★★★★★

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O3 is made from O2 by a silent electric discharge (Siemens ozoniser); Cl2 is made from HCl by catalytic oxidation with O2 over CuCl2 at ~723 K (Deacon's process).

Preparation of O3 from O2: Dry, cold oxygen gas is passed through a Siemens ozoniser, where a silent (non-sparking) high-voltage electric discharge is applied between two electrodes. This supplies enough energy to convert a fraction of O2 into O3, an endothermic reaction: $3O_2 \xrightarrow{\text{silent electric discharge}} 2O_3 \qquad (\Delta H > 0)$ Ozone is unstable and readily reverts to O2, so the equilibrium mixture (ozonised oxygen) is used directly or O3 is condensed out at low temperature.
Preparation of Cl2 from HCl (Deacon's process): HCl gas, mixed with air/oxygen, is passed over a catalyst of cupric chloride (CuCl2) heated to about 723 K (450 degC): …

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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.How will you prepare the following (Write with conditions and equation):

Concept understanding — Ozone

Q.How will you prepare the following (Write with conditions and equation):

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