(C) The troposphere is the lowest layer of the atmosphere. It primarily contains $N_2$ and $O_2$,along with small amounts of $CO_2$,water vapor,and ot

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Mainly $O_2$ and $N_2$ along with $CO_2$ and water vapor

(C) The troposphere is the lowest layer of the atmosphere. It primarily contains $N_2$ and $O_2$,along with small amounts of $CO_2$,water vapor,and other trace gases.

Class 11 Chemistry Environmental Chemistry Environmental Study

Medium

What does the troposphere contain?

A
Only $O_2$
B
Only $N_2$
C
Mainly $O_2$ and $N_2$ along with $CO_2$ and water vapor
D
Only inert gases

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Class 11

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Chapter

Environmental Chemistry

Subtopic

Environmental Study

Match the following:

List-$I$ (Pollutant concentration limit in water) List-$II$ (Effect)

$A. Pb > 50 \ ppb$ $I. \text{Liver damage}$

$B. SO_4^{2-} > 500 \ ppm$ $II. \text{Laxative effect}$

$C. NO_3^{-} > 50 \ ppm$ $III. \text{Blue baby syndrome}$

$D. F^{-} > 2 \ ppm$ $IV. \text{Brown mottling of teeth}$

The correct answer is

List-$I$ (Pollutant concentration limit in water)	List-$II$ (Effect)
$A. Pb > 50 \ ppb$	$I. \text{Liver damage}$
$B. SO_4^{2-} > 500 \ ppm$	$II. \text{Laxative effect}$
$C. NO_3^{-} > 50 \ ppm$	$III. \text{Blue baby syndrome}$
$D. F^{-} > 2 \ ppm$	$IV. \text{Brown mottling of teeth}$