What will be the residue left on the watch glass on heating blue ink in it?

What is the need to heat solution?

Pure copper sulphate can be obtained form an impure sample by the process of :

How will you separate a mixture of iron filings and sulphur powder without using carbon disulphide?

Describe a method to separate a mixture of camphor and sand.

How will you separate a mixture of iron filings and powdered carbon?

You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture?

Which separation techniques will you apply for the separation of the following?

(a) The different pigments from an extract of flower petals

(b) Butter from curd

(c) Oil from water

(d) Tea leaves from tea

(e) Iron pins from sand

(f) Wheat grains from husk

(g) Fine mud particles floating in water.

How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water?

You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture?