Chemical Environmental Engineering

A. Alum
B. Bleaching powder
C. Activated carbon
D. Copper sulphate

B. Cooling and freezing of water kills the bacteria present in it
C. With increasing boiler operating pressure of steam, the maximum allowable concentration of
silica in feed water goes on decreasing
D. Dissolved oxygen content in high pressure boiler feed water should be nil

A. Dental cavities
B. Scale formation
C. Water-borne disease
D. Corrosion

A. Coagulation and flocculation of colloids
B. Oxidation of carbonaceous matter to CO2
C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter
to the nitrite and eventually to the nitrate
D. All A., B. and C.

A. 0.001
B. 0.1
C. 1
D. 5

A. Reduction in its dissolved oxygen content
B. Discoloration of bathroom fixtures
C. Temporary hardness
D. None of these

A. Undesirable plants growth
B. Depletion of oxygen
C. Fire hazards
D. Explosion hazards

A. Cancer
B. Asthma
C. Silicosis
D. Fluorosis (bone disease)

A. Bacterial stability factor
B. Relative stability
C. Biological oxygen demand (BOD)
D. Oxygen ion concentration

A. t = 15 – 0.0065h
B. t = 15 + 0.0065h
C. t = 0.0035h -15
D. t = 15 – 0.0035h