A. Carbonates
B. Bi-carbonates
C. Iron & manganese
D. Arsenic
Related Mcqs:
- Presence of _____________ hardness is responsible for the temporary hardness in water?
A. Carbonate
B. Calcium
C. Chloride
D. Sulphate - Inorganic impurities causing water pollution is ____________________?
A. Fats
B. Carbohydrates
C. Salts of metals
D. Protein - For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?
A. 10000
B. 5
C. 500
D. 1000 - Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?
A. Mercury
B. Lead
C. Fluoride
D. Arsenic - Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?
A. Chemical coagulation
B. Floatation & skimming
C. Centrifugation
D. Ultra filtration - Growth of ______________ is promoted by the presence of manganese in water?
A. Files
B. Algae
C. Micro-organisms
D. Mosquitoes - Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?
A. Natural aeration of water stream
B. Photosynthetic action of algae
C. Both A. & B.
D. Neither A. nor B. - Dissolved oxygen content in river water is around _____________ ppm?
A. 5
B. 100
C. 250
D. 500 - Color test of water is done with an instrument called__________________?
A. Tintometer
B. Colorimeter
C. Electro-chemical cell
D. Turbidimeter - The enthalpy change when ammonia gas is dissolved in water is called the heat of___________________?
A. Solution
B. Formation
C. Dilution
D. Combustion
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