CHEMISTRY [1 Mark Question Answer]

Water is called the universal solvent as it dissolves a large number of substances in it to form solutions.

Boiling is the easiest and cheapest method of water purification at home. It kills germs and feasible at home.

Conservation of water refers to preventing the wastage of water without affecting day-to-day life.

Boiling, Filteration

Bleaching powder releases chlorine which dissolves in water and kills germs. Hence, it is used to purify water by destroying germs present in it.

Rainwater is the purest form of natural water since it is formed by condensation of water vapour.

(a) Rainwater, river, lake, sea, ocean.
(b) Rainwater and water bodies like rivers, streams, etc.

Rainwater and the water from the water bodies that seep through the soil and collects over the non-porous rocks inside the earth is called underground water or ground water.

Surface water is any source of water that flows or is stored on the surface of the earth. It includes rainwater and the water in rivers, lakes, seas and oceans.

Solubility – The quantity of a solute that dissolves in a given quantity of a solvent at a specific temperature is called the solubility of the solute. It is expressed in terms of grams of solute per 100 g of solvent.

Saturated solution – A saturated solution is a solution in which no more solute can dissolve at a given temperature.

Potable water – Water that is fit for drinking is called potable water.

Transpiration – Transpiration is the process by which plants lose water in the form of water vapour to the atmosphere through leaves.

Water cycle – The continuous circulation of water from the earth to the atmosphere and back to the earth is called as the water cycle.

It more solute can dissolve in the solution at a given temperature, it is unsaturated solution. If more solute cannot dissolve in the solution at a given temperature, it is saturated solutioa

Water is called the universal solvent because it dissolves a large number of substances to form solutions.

Bleaching powder or chlorine tablet and potassium permanganate.

Water that is fit for drinking is called potable water.

Water cycle

Gasesous form (water vapour)

Sea water contains a large amount of dissolved salts and therefore, cannot be used for drinking or irrigation directly.

Rainwater