Hello dear,

Physical chemistry in jee mains is as important as organic and inorganic chemistry. Apart, every subject has equal importance and weightage in jee mains. It's better if all the topics are done thoroughly.

Moreover, topic wise questions that come in jee are given below,

Topic                                                             Questions

Some basic concept of chemistry -         1

Redox Reaction -         1

Electrochemistry  -    1

Chemical Kinetics -    1

Solutions -         1

Atomic Structure -       2

Chemical Bonding -      2

Thermodynamics & Gaseous State - 2

Equilibrium -           2

States of Matter -              2

Solid States -          2

Electro Chemistry -       1

Surface Chemistry -      2

further, follow this link for more information :

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

I hope that this helps.