B.Sc Chemistry

Yes, Chemistry has good scope till humans exist.
If you want Chemistry oriented jobs and excepting decent pay, then B.Sc. is not quite enough in my experience and knowledge.
Because you may result with an 8 to 10 hr of job which pays you 10k-15k a month.
M.Sc. has significantly more industrial value and more jobs opportunities in both the Industrial sector and the Research sector.
If you have some special contact or strong recommendation in the Industrial sector then BSc may be enough to manage tasks that require only trained but not logical thinking.

For M.Sc. Chemistry admission in Loyola College, you should have passed your all graduation degree papers with a minimum score of 55-60% in aggregate. Apply online when admission is open (probably after April) on the official website and follow the guidelines mentioned on the website.

Yes,
You can apply for M.Sc. Chemistry.

If you asking for an MSc entrance exam for admission in NITT, then it is called JAM and it is over for this year 2022 and conducted on 13th Feb 2022.

Yes,
You can apply for B.Tech Chemical Engineering through a GATE score. The best institutes for B.Tech Chemical Engineering are IITs, NITs, etc., State universities like BHU, JNU, etc., and Colleges like VIT, MIT, etc.

Yes,
Eligibility: Pass in all subjects of 12th grade with Science subjects (PCM or PCB).
Admission: through JEE Main exam.

B.Sc. Chemistry takes 3 years,
M.Sc. Chemistry takes another 2 years,
Ph.D. Chemistry takes 3 to 5 years depending upon your research output and willingness. The general eligibility for B.Sc. Chemistry admission is passed in all subjects of 12th grade with Science subjects like PCM. Score as much as possible to get admission easily.

Go with your interest because each of them has its own importance in the industry.
If you have an idea of doing research, then go for the branch which contains your research interest topic.

Yes,
Eligibility: Pass in all subjects of 12th grade with Science subjects (PCM or PCB).
Admission: through JEE Main exam.

Yes, it doesn't require deep math skills but you should be strong at basic math like Algebra Trigonometry Calculus (Limits, differentials and Integrals Matrices and Functions.