The general rule for choosing a solvent is "like dissolves like".
In general terms, a substance that dissolves in a solvent is called a solute. The result is a solution.
hydrocarbons are not soluble in a polar solvent but are soluble in a non-polar solvent.
In choosing solvent i would consider the following factors: What are the solutes? - are they polar or nonpolar how should they be dissolved What is the next step? - E.G. Do you need to distil or heat, then boiling point would be important. Is the solvent inert? Obviously side reactions are bad so choose a solvent which will not react. Good solvents are ethyl ether or ethyl alcohol.
As rule (but not general) a polar compound is dissolved in a polar solvent and inverse.
it depends upon dye but in general mixture consists of pigments , binder and a solvent as water.
Hexane is used because it is relatively unreactive. Actually, any solvent that is unreactive can be used. However, the general criteria to be employed in choosing a solvent are 1) its solubility/polarity to the mixture/solute, 2) its boiling point is lower than the solute/analyte and 3) it is unreactive.
Chester General rail crash happened in 1972.
A solvent and a solute.
In general it is any solvent that has chlorine in the molecule. CHCl3 called chloroform, or trichloromethane is one such solvent.
Prisoners first entered the Auschwitz complex by rail. One of the reasons for choosing the location was that it was close to a major rail junction.
In general terms, a substance that dissolves in a solvent is called a solute. The result is a solution.
nonpolor
I think you mean fuel injection service. It's when you hook up a small container full of a cleaning agent (like a solvent) to the fuel rail and using compressed air push the solvent though the fuel rail and injectors for about 30 minutes while letting the engine run.
hydrocarbons are not soluble in a polar solvent but are soluble in a non-polar solvent.
it must be able to dissolve the solute.
There are many different solvents and many different chemicals which may or may not mix with a given solvent. Your question is too general.
heat the mix