Science

Yes. You can go for Chemical engineering after B.Sc. Chemistry by clearing GATE exam.
Some institutes allow GATE scorers with B.Sc. Chemistry for a 2 year B.Tech. /B.E. (Chemical engineering) programme.

Physical adsorption (Physisorption) occurs due to weak attraction of charges between atoms in different molecules. It is temporary effect. For example : Vanderwaals attraction.
Chemical adsorption (Chemisorption) occurs due to mere intermolecular interaction between atoms in different molecules. Some of them are temporary and some are permanent. For example : Ion-Dipole interaction.

A chemical reactions is the result of change of atoms/molecules when combined with other atoms/molecules to reach a stable state.

Here are the best books for inorganic chemistry to prepare for JEE Advanced-
Concise Inorganic Chemistry by J. D. Lee (Conceptual)
Inorganic Chemistry by Puri Sharma Kalia (Textbook & simple English)

You can download previous year question papers of IIT JAM Chemistry on official websites. JAM Chemistry questions are based on basic concepts and understanding about Chemistry.

Hi. You can check the official website of IGNOU for admission information. Thanks.

Hi. You can do food and nutrition course from IGNOU. Thanks.

Hi. IGNOU Acharya Nagarjuna University, Andhra Pradesh, UP Rajarshi Tandon open university, UP
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Hi. For information, you can see the below link
https://www.shiksha.com/college/phansidewa-primary-teachers-training-institute-darjeeling-144157/course-b-ed-in-bengali-english-math-688935
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Hi. For fees information, you can see the below link
https://www.shiksha.com/college/moulana-azad-institute-of-humanities-science-and-technology-sitapur-120319/courses/bed-bc
Thanks.