Why does water covered with excessive algae growth become polluted?

In what regions of the atmosphere,the temperature increases with altitude and in which regions it decreases?

Name three natural sources of air pollution.

What are viable and non-viable particulates?

What is the nature of 'London smog' and why?

What is the composition of photochemical smog?

Photochemical smog occurs in warm, dry and sunny climate. Among SO₂, NO₂, O₃ and hydrocarbons which one is not amongst the components of photochemical smog and why?

Why 'photochemical smog' is called so?

From where does ozone come in the photochemical smog?

How is ozone produced in the stratosphere?

In your opinion what measures will you take to save your valuable monument from acid rain?

How is green chemistry a revolutionary step in protecting our environment and society?

(i) State the Heisenberg's uncertainty principle.
(ii) Write down the significance of Heisenberg principle.
(iii) Do you think it has utility in your daily life? Justify your answer

While working in laboratory a student kept ferrous sulphate in a vessel made up of zinc. After few days he found cracks in the container.
(i) Why cracks were found in the container?
(ii) Write down the chemical reaction takes place.
(iii) What is the value associated with this?

A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.

For your agricultural field or garden, you have developed a compost-producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.

Mr. Grover owner of a dry cleaning shop, was using terachloromethane eralier as a solvent for dry-cleaning. The compound containers the ground water and is also suspected carcinogenic. Mr. Raj owner of another dry cleaning shop is using CO ₂ these days.
Hydrogen peroxide is being used for bleaching purpose.
(i) What is the advantages of using liquid Co₂ with suitable detergent for dry-cleaning?
(ii) What is the advantage of using H₂O₂ as bleaching agent?
(iii) What values are possessed by Mr. Raj?

VVhichgases are responsible for greenhouse effect? List some of them.

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

Have you ever observed any water pollution in your area? What measures would you suggest to control it?

Do you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?

How can you apply green chemistry for the following?
(i) To control photochemical smog
(ii) To avoid use of halogenated solvents in dry
(iii) To reduce use of synthetic detergents
(iv) To reduce the consumption of petrol and diesel