81.

Which of the following has highest concentration of PAN?

• Smoke

• Ozone

• Photochemical smog

• Reducing smog

Which of the following is not a greenhouse gas?

• Carbon dioxide

• Water vapours

• Methane

• Oxygen

Living in the atmosphere of CO is dangerous, because it

• combines with O, present inside to form CO₂

• reduces organic matter of tissues

• combines with haemoglobin and makes it incapable to absorb oxygen

• dries up the blood.

Which of the following is not a green house gas?

• Hydrogen

• Carbon dioxide

• Methane

• Nitrous oxide or N₂O

White lung cancer is caused by :

• asbestos

• silica

• paper

• textiles

Green chemistry means such reactions which

• are related to the depletion of ozone layer

• study the reactions in plants

• produce colour during reactions

• reduce the use and production of hazardous chemicals.

The radiant energy from the sun is due to :

• combustion

• chemical reaction

• nuclear fusion

• nuclear fission

Which of the following chemicals are used to manufacture methyl isocyanate that caused "Bhopal Tragedy"?

(i) methylamine 

(ii) phosgene

(iii) phosphine

(iv) dimethylamine

• (i) and (iii)

• (iii) and (iv)

• (i) and (ii)

• (ii) and (iv)

Ozone in stratosphere is depleted by

• CF₂Cl₂

• C₇F₁₆

• C₆H₆Cl₆

• C₆F₆

Which of the following is not a green house gas?

• Carbon dioxide

• Water vapour

• Methane

• Oxygen