Hello Aspirant,

Yes of course Nuclear Chemistry is there in the syllabus of JEE-Main and as per the analysis of JEE-Main 2020 and 2019 it contributes for around 8 marks in complete JEE-Main paper. For JEE-Main 2021, complete chapter wise weightage for chemistry is described below :-

@Chemistry

Transition Elements and Coordination Chemistry  :-  12 marks

Periodic table and Representative Elements :- 12 marks

Thermodynamics And Gaseous State:- 8 marks

Atomic Structure:- 8 marks

Chemical Bonding:- 8 marks

Chemical And Ionic Equilibrium:- 8 marks

Solid State And Surface Chemistry :- 4 marks

Nuclear Chemistry And Environment:- 8 marks

Mole Concept :- 4 marks

Redox Reaction :- 4 marks

Electrochemistry :- 4 marks

Chemical Kinetics:- 4 marks

Solution and Colligative Properties :- 4 marks

General Organic Chemistry:- 4 marks

Stereochemistry:- 4 marks

Hydrocarbon :- 4 marks

Alkyl Halides :- 4 marks

Carboxylic Acid and their Derivatives:- 4 marks

Carbohydrates,amino acid and Polymers :- 4 marks

Aromatic Compounds :- 4 marks

For complete details about important chapters and other weightage related information kindly check out the links given below :-

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

You can also check out JEE-Main 2021 Learner package for your preparation :-

https://learn.careers360.com/jee-main-coaching/?utm_source=%20QnA

I hope this information helps you.

Good Luck!!