Hydrogen ion concentration in distilled water is___________________?
Hydrogen ion concentration in distilled water is___________________?
A. 10-7
B. 7 × 10-7
C. 107
D. 7 × 107
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Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?A. Radioactive
B. Organic
C. Inorganic
D. None of theseOn prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?A. Of clotting of blood
B. Of jamming of respiratory tract
C. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
incapable of absorbing oxygen
D. It forms CO2 by combining with oxygen present in the bloodWorld’s worst radioactive pollution was caused by nuclear reactor disaster which occured in ___________________?
World’s worst radioactive pollution was caused by nuclear reactor disaster which occured in ___________________?A. Arizona (U.S.A.)
B. Chernobyl (undivided U.S.S.R.)
C. Pennsylvania (U.S.A.)
D. Moscow (U.S.S.R.)TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?A. 5
B. 100
C. 1000
D. 2000The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?A. Dissolved oxygen content
B. Biological oxygen demand
C. Vapor pressure
D. All A., B. and C.Presence of _____________ hardness is responsible for the temporary hardness in water?
Presence of _____________ hardness is responsible for the temporary hardness in water?A. Carbonate
B. Calcium
C. Chloride
D. Sulphate