Water analysis

Characteristic of pure water

• Colourless

• Odourless

• Tasteless

• Freezing point 0 F

• Free of impurities

Which among the following is/are anthropogenic source of contaminating water

• Slitation

• Agricultural discharges

• Industrial effluent

• Sewage

Objective of water treatment.

• To remove colour, objectionable odour and taste

• To remove pathogenic bacteria.

• To make water safe for drinking and domestic purposes

• All of the above

Which water source should usually have more dissolved solids.

• Fresh water lake

• River

• Sea water

Water used for drinking may have agreeable taste

• True

• False

Sedimentation process removes all the suspended particles.

• True

• False

Which of the following method used in water purification improves taste of the water.

• Chlorination

• Ozonation

• Areation

• Chemical disinfection

Which amongst the following reagents are used to analyse dissolved oxygen.

• KMnO4

• H2SO4

• KI

• All of the above

What is BOD

• It is a measure of the amount of oxygen required by aerobic microorganisms to break down organic matter in a water sample over a specific time period.

• the total quantity of oxygen required to oxidize both organic and inorganic substances in water

• the amount of oxygen that is present in water in its dissolved form

The determination of COD is slower than determination of BOD.

• True

• False