ماحولیاتی کیمیا: پانی

Hard water contains dissolved salts of:

• 1 Calcium and magnesium
• 2 Sodium
• 3 Hydrogen
• 4 Potassium only

Temporary hardness is removed by:

• 1 Filtering
• 2 Freezing
• 3 Boiling
• 4 Adding salt

Which of these is a water pollutant?

• 1 Nitrogen
• 2 Sewage
• 3 Hydrogen
• 4 Oxygen

Chlorine is added to drinking water to:

• 1 Make it hard
• 2 Add taste only
• 3 Add colour
• 4 Kill germs

Soap does not lather easily in:

• 1 Distilled water
• 2 Soft water
• 3 Rain water
• 4 Hard water