Chemistry

For Chemistry (Foreign authors)
1. Concise Inorganic Chemistry by J. D. Lee
2. Organic Chemistry by Clayden or Organic Chemistry by Morrison and Boyd
3. Physical Chemistry by Atkins (Indian authors)
1. Inorganic Chemistry by Puri Sharma Kalia
2. Organic Chemistry by Bahl and Arun Bahl
3. Physical Chemistry by Puri Sharma Pathania.

Yes, admission for B.Sc. Chemistry requires pass in all subjects of 12th grade in school.

Biotechnology is about applications of Biology with some Physics and Chemistry to develop biological techniques in the real world. Chemistry is about applications of Physics and mathematics in Chemistry to develop both theoretical and experimental methods to improve/create the desired products. Zoology is about the study of diverse animals (all) of diverse environments. It requires knowledge from botany and basic Chemistry and Physics.

If you have an interest in Chemistry and 2 years of time, then M.Sc. In Chemistry, disciplines would be a great option for a career boost in Chemistry. Since in M.Sc. You can get ideas about research and optimization of products and processing which will help you to get a good career in Chemistry. You can also join PG Diploma courses like chemical Lab Technician, laboratory instrumentation, etc.

If you have an interest in Chemistry and 2 years of time, then M.Sc. In Chemistry, disciplines would be a great option for a career boost in Chemistry. Since in M.Sc. You can get ideas about research and optimization of products and processing which will help you to get a good career in the chemical industry.

Jobs opportunities for B.Sc. Chemistry are available but payment will be quite low (less than 15k per month) in private sector. You can join M.Sc. in Chemistry disciplines if you want to continue your career in Chemistry. MBA after B.Sc. Chemistry is a obvious change of career, since Chemistry career is about research and optimization of product/process or teaching if you are interested. If you are okay with changing career, then MBA can be an option.

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.

Balancing chemical equations : Assume you were doing a trade game, you have to balance profit and loss so that you can manage the game. It is the same way to balance a chemical equation. There are different atoms (assume them as different fruits/balls) and the reaction arrow separates reactants on left (loss) and products on right (profit). Now, just guess and try to arrange numbers in a way that you get the equal number of same atom (fruit/ball) on both sides. Try this until all atoms got equally on both sides.