A. Fats
B. Carbohydrates
C. Salts of metals
D. Protein
A. Positively charged
B. Negatively charged
C. Neutral
D. Combination of all A., B. & C.
A. Ozone
B. Photochemical smog
C. Sulphur dioxide
D. All A., B. & C.
A. Silica
B. Turbidity
C. Phenol
D. Dissolved oxygen
A. Aerobic
B. Pathogenic
C. Anaerobic
D. Non-pathogenic
A. 1
B. 25
C. 150
D. 650
A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
B. Appears only on sunny days
C. Is harmful for crops and trees also besides causing eye irritation & asthma
D. All A., B. & C.