Matter is made up of atoms which are made from protons, neutrons, electrons which are further made up quarks and strings.
 
	
This is based on ideal gas law PV=nRT.
	
Where P is pressure, V is volume, R is gas constant and T is temperature. Hence from liquid to solid or solid to liquid the transition has to cross the grey zone.
	
This grey zone transition is is very crucial which includes the inter molecular forces acting on the molecules and each atoms which makes the change in state from hot to cold and cold to hot.
	
The best example is ice crystal formation and water formation from ice crystal .
	
Hence the inter molecular force of attraction happens to be involved with changes in grey zone.
Unified field theory,, in particle physics, an attempt to describe all fundamental forces and the relationships between elementary particles in terms of a single theoretical framework. In physics, forces can be described by fields that mediate interactions between separate objects.
 
If the universe did begin with a rapid expansion, per the Big Bang theory, then life as we know it sprung from nonliving matter. ... It proposes that in Earth's prebiotic history, simple organic matter was exposed to energy in the form of volcanoes and electrical storms.
 
 
						

							
	
Practice previous year questions many times..
	
Appear for a test series and analyse it properly (Giving 2–3 hours)
	
Revise your notes multiple times till they enter your soul :)
	
Find your strong points and chapters, work on them..
	
Solve other people’s doubts. It makes your own concepts very clear