Problem 73
If there was no carbon dioxide on earth's surface, the temperature of earth's surface would be (a) same as present (b) less than the present (c) more than the present (d) dependent on the amount of oxygen in the atmosphere
Problem 74
Pollutant is a chemical substance or factor which disturbs (a) our balanced cnvironment (b) gcochemical cycles (c) flora of any region (d) fauna of any region
Problem 76
Green chemistry mcans such reactions which (a) are related to the depletion of ozone layer (b) produce colour during reactions (c) study the reactions in plants (d) reduce the use and production of hazardous chemicals
Problem 77
Which of the following is a secondary pollutant? (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{N}_{2} \mathrm{O}\) (c) \(\mathrm{PAN}\) (d) \(\mathrm{SO}_{2}\)
Problem 78
The secondary precursors of photochemical smog are (a) \(\mathrm{SO}_{2}\) and \(\mathrm{NO}_{2}\) (b) \(\mathrm{SO}_{2}\) and hydrocarbons (c) \(\mathrm{NO}_{2}\) and hydrocarbons (d) \(\mathrm{O}_{3}\) and \(\mathrm{PAN}\)
Problem 79
Particulates are added to the atmosphere by (a) industrial process (b) combustion of fucls (c) agricultural burning (d) all of these
Problem 80
Which of the following statement is correct? (a) Classical smog is reducing in nature. (b) Photochemical smog is oxidizing in nature. (c) Classical smog is formed in cool, humid climate while photochemical smog is formed in dry, warm climates. (d) All are correct.
