Hello Roz K,
To become a forensic expert in India after doing Bachelors in Chemistry you will have to do Masters in Forensic Science.
The requirement for you to do MSc. In forensic science a candidate must hold a bachelors degree in any of the science subjects.
And about the specialization in pathology, toxicology , etc. you can opt for thee in your master's degree.
HOPE THIS INFORAMATION WAS HELPFUL
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