The gas emitted by supersonic jet planes that slowly depletes the concentration of ozone layer is

• CO

• NO

• SO₂

• O₂

The photochemical smog can be suppressed by

• nitrogen oxides

• hydrocarbons

• radical traps

• formaldehyde

Which among the following statements are correct?

(i) Carbon monoxide is neutral whereas SO₃ is acidic.

(ii) Potassium oxide is basic whereas nitrous oxide is acidic.

(iii) Aluminium and zinc oxides are amphoteric.

(iv) Sulphur trioxide is acidic whereas phosphorus pentoxide is basic.

(v) Carbon dioxide is netural whereas sulphur dioxide is amphoteric.

• (ii) and (iii)

• (i) and (iv)

• (i) and (iii)

• (ii) and (iv)

Pick up the correct statement :

• CO which is major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog

• Classical smog has an oxidizing character while the photochemical smog is reducing in character

• Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours

• During formation of smog the level of ozone in the atmosphere goes down

In Antarctica ozone depletion is due to the formation of following compound :

• acrolein

• peroxyacetyl nitrate

• chlorine nitrate

• formaldehyde

Which one of the following is mainly responsible for depletion of ozone layer?

• Methane

• Cabon dioxide

• Water

• Chloro-fluoro carbons

Water is considered to be polluted if the dissolved oxygen D.O. content is less than ....  ppm

• 5

• 10

• 15

• 100

118.

Identify the correct decreasing order of the following with respect to altitude from atmosphere

I. Troposphere

II. Mesosphere

III. Thermosphere

• II, III, I

• III, II, I

• I, II, III

• I, III, II

Which of the following is not an air pollutant?

• N₂

• N₂O

• NO

• CO

CFCl₃ is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen ?

• Cl₂

• Cl^-

• F^-

• Cl^*