Chemical Environmental Engineering

A. Preheating of feed water
B. Reduction in hardness, silica & alumina in feed water
C. Keeping the pH value of feed water just below 7
D. Eliminating H2S in feed water

A. 120
B. 140
C. 170
D. 200

A. Turbidity
B. Disease
C. Bad odour
D. Bad taste & colour

A. 0.1
B. 25
C. 100
D. 1000

A. Biological oxygen treatment
B. Coagulation and filtration
C. Adsorption in ion exchange materials
D. None of these

A. Silica gel
B. Active carbon
C. Bog iron
D. Limestone powder

A. 1
B. 10
C. 250
D. 1000

A. Blood poisoning
B. Anaemia
C. Nervous system disorder
D. All A., B. & C.

A. Allows visible solar radiation (ultraviolet) of short wave-length to pass through
B. Reflects and absorbs the longer wavelength (infra-red) radiations
C. Prevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming
D. All A., B. and C.

A. NOx
B. Hg
C. SO2
D. F