In orthotolodine test, safe residual for drinking water is indicated by

Related MCQs

• Bio-chemical oxygen demand (B.O.D.) of safe drinking water must be
• The amount of residual chlorine in treated water is determined by the
• Residual chlorine in water is determined by
• The maximum permissible hardness in water for drinking purposes should not exceed 100 ppm.
• The most commonly used disinfectant for drinking water throughout the world is
• The residual chlorine
• Water test is conducted for house plumbings.
• The most important source of water for public water supply is
• The presence of calcium and magnesium bi-carbonates in water causes hardness in the water.
• The water obtained from a lake is known as surface water.