Alum helps to purify the muddy water by:
1. Absorption 2. Dialysis
3. Precipitation 4. Coagulation
___________ separation technique is used in ?Forensic science?
(1) Crystallisation (2) Distillation
(3) Fractional distillation (4) Chromatography

Dear Student
1. Alum is generally used to purify muddy water. This type of process is done by the process called coagulation in which stability of the lyophobic sols is due to presence of charge on colloidal particles.
So, option 4 is correct.
2. In forensics, chromatography method is used to identify and analyse substances found at a crime scene. Every mixture is made up of molecules of different chemicals, in varying amounts. Chromatography works by separating the chemicals out of a mixture and studying how the molecules behave during the separation process.
So, option 4 is correct.
Regards

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Ans:- (4) Chromatography 
Explanation:-
In forensics, police use chromatography to identify and analyse substances found at a crime scene. Every mixture is made up of molecules of different chemicals, in varying amounts. Chromatography works by separating the chemicals out of a mixture and studying how the molecules behave during the separation process.
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