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

Which of the following will show 'Tyndall effect'?

What is meant by a pure substance?

To make a saturated solution,$36 \,g$ of sodium chloride is dissolved in $100 \,g$ of water at $293 \,K$. Find its concentration at this temperature. (in $,\%$)

Which separation techniques will you apply for the separation of the following?
$(a)$ Sodium chloride from its solution in water.
$(b)$ Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
$(c)$ Small pieces of metal in the engine oil of a car.
$(d)$ Different pigments from an extract of flower petals.
$(e)$ Butter from curd.

Classify the following into elements,compounds,and mixtures:
$(a)$ Sodium $(b)$ Soil $(c)$ Sugar solution $(d)$ Silver $(e)$ Calcium carbonate $(f)$ Tin
$(g)$ Silicon $(h)$ Coal $(i)$ Air $(j)$ Soap $(k)$ Methane $(l)$ Carbon dioxide $(m)$ Blood