Dear student

Number of questions for any subjects are not fixed for jee mains exam it will all depends on examiners mind what amount of questions They will ask from particular subject. As chemistry have total of 30 questions and there are three parts i.e, physical, organics,and inorganic chemistry do they always try to give equal amount of questions from all three part . So you can expect in range of 8-12 questions from inorganic chemistry. So you can do your preparation according to it. Also give equal importance for both 11th &12th topic they can ask from any topic of both parts. So be prepared for every topic. Read biochemistry, chemistry in every day life, polymers. This three chapters sometimes gives you 2 questions which are purely theory based from NCERT which you can solve easily.

Hope I may have resolved your query

All the best!!

Hello

You get around 13-16 questions from inorganic.

And 3-4 questions are from p block mostly.
Try preparing NCERT Book first and then move with cengage publications and Arihant as they give a variety of questions to know and also provide you with solution to get to know the easiest method to solve.

All the best