Define dilute and concentrated solutions.

Give one example of each of gaseous and solid solutions.

Why efflorescence increase with increase in temperature.

Write two example of deliquescent substance.

What is the cause of hardness of water ?

Write one advantage of soft water.

Why water is called universal solvent?

What is the particle size of solution ?

What is the effect of temperature on the solubility of ${\mathrm{CaSO}}_4$ in water ?