HARD WATER

The purest form of water is

• distilled water

• Rainwater

• Electrolysed water

• Fresh water

Temporary hardness

• Cannot be removed by boiling

• Bicarbonates of calcium

• Carbonates of calcium and magnesium

• Chlorides of calcium

The insoluble, sticky white precipitate is called

How is the toxicity of lead an advantage of hard water?

Hard water causes

• Corrosion of Boiler

• Wastage of hand wash

• Removes layer of scum

• Wastes fuel

TRUE OR FALSE : All types of hard water are not softened by using washing soda.

• True

• False

State any two advantages of hard water.

What is free from dissolved salts

• Pure water

• Distilled water

• Both of them

• None of them

H2CO3

• Hydrogen carbon-oxide

• Carbonic acid

• Hydrocarbon

• All of them