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Introduction to Air Pollutants & Troposhpheric Pollutants

The zone whic...

Question

The zone which extends above troposphere up to 50 km above sea level and contains dinitrogen, dioxygen, ozone and little water vapour is called:

A

exosphere

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B

mesosphere

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C

ionosphere

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D

stratosphere

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Solution

The correct option is D stratosphere
Stratosphere ranges from 20-50 km. It is the layer above troposphere. Stratosphere contains ozone as it's main species.

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Q. Complete the following passage(s) with an appropriate word/term to be filled in the blank spaces.
Troposphere, Stratosphere, Triatomic, Ozonosphere, Ozone shield, Diatomic, Ozone, Equator, Poles, Reactive.
Ozone is a __(1)__molecule made up of three atoms of oxygen,

O_{3}

. The normal oxygen molecule is __(2)__. Oxygen is essential for all aerobic forms and combustion activities. __(3)__ is a deadly poison. Very little of it is present in the lower part of the atmosphere called __(4)__. A good quantity of ozone is present in the stratum of the atmosphere called __(5)__. It lies above the troposphere and extends between 16-50 km of height above __(6)__ and 8-30 km above __(7)__. Here, it is formed in situ from oxygen by the action of high energy ultraviolet rays. The latter split some oxygen molecules into nascent or atomic oxygen (O). Atomic oxygen is highly __(8)__. It combines with (

O_{2}

) to form ozone. The area of the stratosphere which is rich in ozone is called the ozone layer or ____(9)____. It is also called __(10) __.

Q. Consider the following statements:
i) The height of the troposphere extends up to 16km near the poles and up to 10km near the equator.
ii) The reason behind spread of troposphere upto 16km is the expansion of air due to heating and rise of the air column.
Which of the above statements are correct?

Q. What is the approximate range of height above sea level for troposphere?

Q. Q. Consider the following statements:Which of the above statement/s is/are correct?

1 and 2 only
2 only
2 and 3 only
1 and 3 only

Q. Assertion :An equilibrium is established between generation and destruction of ozone, leading to a steady state concentration of ozone layer in the stratosphere at an altitude of 20-30 km above sea level. Reason: The thickness of the ozone layer is generally larger above the equator and smaller above the poles.

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Introduction to Air Pollutants & Troposhpheric Pollutants

Standard XII Chemistry

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