(C) Aerosols,such as hair sprays,deodorants,and insecticides,historically used chlorofluorocarbons $(CFCs)$ as propellants. These compounds are stable

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(C) Aerosols,such as hair sprays,deodorants,and insecticides,historically used chlorofluorocarbons $(CFCs)$ as propellants. These compounds are stable and non-toxic,making them suitable for this purpose,although they are now restricted due to their role in ozone layer depletion.

Class 11 Chemistry Environmental Chemistry Environmental Study

Easy

Which of the following is used in aerosols?

A
$NO_2$
B
$SO_2$
C
$CFC$
D
$CO_2$

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Class 11 Questions

Class 11

Chemistry Questions

Chapter

Environmental Chemistry

Subtopic

Environmental Study

$A$ water sample is reported to be highly polluted if the $BOD$ (Biological Oxygen Demand) value of the sample becomes:

DifficultAIEEE 2012

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Water pollution is caused due to

Medium

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Which principle of green chemistry highlights that the protection of a selective group is not advantageous?

EasyMHT CET 2025

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