141.

Which one of the following is not a common component of photo-chemical smog?

• Ozone

• Acrolein

• Peroxy acetyl nitrate

• Chloroflourocarbons

Producer gas is a mixture of:

• CO and N₂

• CO₂ and H₂

• N₂ and O₂

• CH₄ and N₂

The radiant energy from the sun is due to :

• combustion

• nuclear fusion

• nuclear fission

• chemical reaction

The smog is essentially caused by the presence of

• O₂ and O₃

• O₂ and N₂

• oxides of sulphur and nitrogen

• O₃ and N₂

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere ?

• Polyhalogens

• Ferrocenes

• Fullerenes

• Freons

Match the Column I and Column II and choose the correct code given below.

Column I	Column II
A. Peroxyacetyl nitrile	i. Waste incineration
B. Indigo	ii. Vat dye
C. IR active molecules	iii. Global warming
D. Dioxins	iv. Photchemical smog

• A - iv; B - ii; C - iii; D - i

• A - i; B - ii; C - iv; D - iii

• A - ii; B - i; C - iv; D - iii

• A - iv; B - i; C - iii; D - ii

Petroleum is obtained from water gas, name of the reaction involved is

• Fischer-Tropsch

• Benzoic

• Dow's

• Kjeldahl's

In municipal sewage, BOD values (in ppm) are:

• 1-5

• 100- 4000

• 50-90

• 20-40

In environmental chemistry, the medium which is affected by a pollutant is called as the.......

• sink

• slag

• solvent

• receptor

The maximum prescribed concentration of copper in drinking water is :

• 0.5 ppm

• 3 ppm

• 0.05 ppm

• 5 ppm