Distinguish between a saturated, an unsaturated and a supersaturated solution.
Water
Original Khojo Papers practice question — not from a past board paper.
A drying agent removes moisture from a gas or a liquid without reacting with it. Concentrated sulphuric acid is one, but it cannot dry ammonia because it reacts with it. Quicklime is another, but it cannot dry hydrogen chloride or carbon dioxide, which are acidic and react with it.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
The drying agent must always be chemically inert towards the substance being dried.
From the same topic and chapter, at a similar level.
Distinguish between a saturated, an unsaturated and a supersaturated solution.
Water
Define efflorescence, deliquescence and hygroscopy, giving one example of each.
Water
Why is water called a universal solvent?
Water
Define solubility and state two factors that affect the solubility of a solid in water.
Water
Distinguish between a hydrated and an anhydrous salt, and state what happens when blue copper sulphate crystals are heated.
Water
The solubility of potassium nitrate at 30 °C is 45 g per 100 g of water. What mass of the salt will saturate 250 g of water at that temperature?
Water