Classify each of the following as a homogeneous or heterogeneous mixture: Air,soda water,vinegar,filtered tea,wood,soil.

Pragya tested the solubility of four different substances at different temperatures and collected the data as given below (results are given in the following table,as grams of substance dissolved in $100 \,g$ of water to form a saturated solution).

< strong>Substance Dissolved	< strong>$283 \,K$	< strong>$293 \,K$	< strong>$313 \,K$	< strong>$333 \,K$	< strong>$353 \,K$
Potassium nitrate	$21$	$32$	$62$	$106$	$167$
Sodium chloride	$36$	$36$	$36$	$37$	$37$
Potassium chloride	$35$	$35$	$40$	$46$	$54$
Ammonium chloride	$24$	$37$	$41$	$55$	$66$

$(a)$ Find the solubility of each salt at $293 \,K$. Which salt has the highest solubility at this temperature?
$(b)$ What is the effect of change of temperature on the solubility of a salt?

Which of the following will show 'Tyndall effect'?

How are sol,solution,and suspension different from each other?

Identify the solutions among the following mixtures:
$(a)$ Soil
$(b)$ Sea water
$(c)$ Air
$(d)$ Coal
$(e)$ Soda water

Which separation techniques will you apply for the separation of the following?
$(a)$ Oil from water.
$(b)$ Tea leaves from tea.
$(c)$ Iron pins from sand.
$(d)$ Wheat grains from husk.
$(e)$ Fine mud particles suspended in water.