CHEMISTRY TRUE / FALSE

Chemical pollutants include a metallic salt solution of mercury and lead.

Water from rivers and lakes is – potable water.

Purification of water is carried out to remove – dissolved gases e.g. carbon dioxide and dissolved minerals like magnesium salts.

If ‘X’ g. of solute is added to 100 g. of water at t°C and the solution formed is a saturated solution, then ‘X’ g. is the solubility of the solute.

Sodium carbonate and sodium sulphate do not form an aqueous solution.

Respiration uses up water from the atmosphere

On boiling water exists in the liquid state.

Water finds application as a means of transporting goods.

Sea water contains salts of calcium and magnesium

Distillation is a good method for purifying water for town supply

Alum is commonly used for removing suspended impurities

Tap water does not contain dissolved impurities.

Water is an element

The process to remove germs in water is also called sterilization

Distilled water is potable water.

Solubility of most solids – decreases with increase in temperature