Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Environmental Chemistry

Short Answer Type

61.

How does hydrocarbon cause pollution? Discuss its harmful effects.

123 Views

Long Answer Type

62.

Discuss the various chemical reactions occurring in the atmosphere ?

124 Views

63. Justify the statement that ozone layer is called ‘earth’s protective umbrella.’
Or
How will you explain the formation of the ozone layer in the atmosphere?

492 Views

64.

What are the reactions involved for ozone layer depletion in the stratosphere?

563 Views

65.

What do you mean by ozone hole? What are its consequences?

748 Views

Short Answer Type

66.

How will you protect the ozone layer ?

104 Views

Long Answer Type

67.

What is smog? Explain its two types.

335 Views

Short Answer Type

68.
What is smog? How is classical smog different from photochemical smog?

The combination of smoke and fog is called smog. The main points of difference are given below:

Classical smog	Photochemical smog
1. It is formed due to the presence of SO₂ and humidity in the air which combine to form H₂SO₄ fog which deposits on the particulate.	It is formed due to the photochemical reaction taking place when the air contains NO₂ and hydrocarbons.
2. It is formed in the months of winter during morning hours when the temperature is low.	It is formed in the months of Summer during the afternoon when there is a bright sunlight.
3. It is reducing in character.	It is oxidising in character.
4. It causes problems in the lungs.	It causes irritation in the eyes.