Category: Chemical Environmental Engineering

A. Silica
B. Turbidity
C. Phenol
D. Dissolved oxygen

A. 20
B. 60
C. 90
D. 120

A. Ferrous sulphate
B. Alum
C. Lime
D. Hydrazine

A. 0.05
B. 1
C. 6.5
D. 15

A. Cesspool
B. Lagoon
C. Skimming mill
D. Septic tank

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. Tanneries
B. Glass & ceramic
C. Beverages
D. Any of these

A. 85
B. 105
C. 125
D. 145

A. Hydrochloric acid
B. Lime
C. Copper sulphate
D. Sodium sulphate

A. 10-7
B. 7 × 10-7
C. 107
D. 7 × 107