Distillation is a useful separating technique because every compound has a unique boiling point. Distillation takes advantage of a compound's boiling point to separate it from other compounds.
Flotation.
separating DNA fragments on the basis of size
Check it out yourself freak. I'm joking. It Gravity separating.
All answers are correct except option b
Ditillation
sedimentation is the technique (method) of separating sand and water. From H.P
Ditillation at different temperatures
Industrial decisions are made based on cost / benefit analysis. Maximum profit for making a certain amount of the substance.
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Panning.
It refers to a set of technique used to separate different compounds. So involves separating chemicals and identifying them by color. Various chromatography products are used during the process.
The physical properties of substances can be used a a technique! :)