(C) Ozone in the stratosphere is a product of $UV$ radiations acting on dioxygen $(O_2)$ molecules.$O_{2(g)} \xrightarrow{UV} O_{(g)} + O_{(g)}$$O_{(g

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(C) Ozone in the stratosphere is a product of $UV$ radiations acting on dioxygen $(O_2)$ molecules.$O_{2(g)} \xrightarrow{UV} O_{(g)} + O_{(g)}$$O_{(g)} + O_{2(g)} \xrightarrow{UV} O_{3(g)}$

Class 11 Chemistry Environmental Chemistry Environmental Study

Difficult

In the stratosphere,most of the ozone formation is assisted by:

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A
cosmic rays
B
$\gamma$-rays
C
ultraviolet radiation
D
visible radiations

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Class 11

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Chapter

Environmental Chemistry

Subtopic

Environmental Study

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Match the water pollutants given in List-$I$ with their sources given in List-$II$.

List-$I$ List-$II$

$A$. Toxic heavy metals $1$. Soil erosion from agricultural and mineral industries.

$B$. Pesticides $2$. Domestic sewage disposal.

$C$. Sediments $3$. Chemical factories and industries.

$D$. Microorganisms $4$. Substances used to kill insects,fungi,and weeds.

List-$I$	List-$II$
$A$. Toxic heavy metals	$1$. Soil erosion from agricultural and mineral industries.
$B$. Pesticides	$2$. Domestic sewage disposal.
$C$. Sediments	$3$. Chemical factories and industries.
$D$. Microorganisms	$4$. Substances used to kill insects,fungi,and weeds.