Q. No.The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is
1. Stratosphere
2. Troposphere
3. Mesosphere
4. Hydrosphere
Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form dioxides of nitrogen because ______.
| 1. | The reaction is endothermic and requires very high temperature |
| 2. | The reaction can be initiated only in presence of a catalyst |
| 3. | Oxides of nitrogen are unstable |
| 4. | N2 and O2 are unreactive |
The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?
1. CO
2. Hydrocarbon
3. Peroxyacetyl nitrate
4. NO
Which of the following statements is correct?
| 1. | Ozone hole is a hole formed in stratosphere from which ozone oozes out |
| 2. | Ozone hole is a hole formed in troposphere from which ozone oozes out |
| 3. | Ozone hole is thinning of ozone layer of stratosphere at some places |
| 4. | Ozone hole means vanishing of ozone layer around the earth completely |
The practice that does not come under green chemistry among the following is-
| 1. | Making use of soap made of vegetable oils instead of using synthetic detergents. |
| 2. | Using H2O2 for bleaching purposes instead of using chlorine-based bleaching agents. |
| 3. | Using bicycles for traveling small distances instead of using petrol/diesel based vehicles. |
| 4. | Using plastic cans for neatly storing substances. |
Which of the following conditions shows the polluted environment?
| a. | pH of rainwater is 5.9 |
| b. | Amount of carbon dioxide in the atmosphere is 0.03% |
| c. | Biochemical oxygen demand 10 ppm |
| d. | Eutrophication |
Choose the correct option
1. (a, b, c)
2. (b, c, d)
3. (c, d)
4. (a, b, d)
Phosphate-containing fertilizers cause water pollution. The addition of such compounds in water bodies causes-
| a. | Enhanced growth of algae |
| b. | Decrease in the amount of dissolved oxygen in the water |
| c. | Deposition of calcium phosphate |
| d. | Increases fish population |
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The acids present in acid rain are :
a. Peroxyacetylnitrate
b. H2CO3
c. HNO3
d. H2SO4
Choose the correct option :
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The consequences of global warming may be ______.
a. Increase in the average temperature of the earth
b. Melting of Himalayan Glaciers
c. Increased biochemical oxygen demand
d. Eutrophication
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Given below are two statements:
| Assertion (A): | Photochemical smog is oxidizing in nature. |
| Reason (R): | Photochemical smog contains NO2 and O3, which are formed during the sequence of reactions. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
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