Marking Scheme for IIT JAM Chemistry Exam:

The marking scheme for the IIT JAM Chemistry exam remains more or less the same as previous years. The exam is conducted in two sessions: Session I and Session II. Each session consists of 30 multiple-choice questions (MCQs) and 10 numerical answer type (NAT) questions.

Session I:
- There are a total of 30 MCQs in this session.
- Each MCQ carries 1 or 2 marks.
- There are three different types of questions: 1-mark MCQs, 2-mark MCQs, and 2-mark MCQs with negative marking.
- For 1-mark MCQs, 1/3 marks are deducted for each wrong answer.
- For 2-mark MCQs, 2/3 marks are deducted for each wrong answer.
- There is no negative marking for unattempted questions.
- The total marks for this session range from 0 to 60.

Session II:
- There are a total of 10 NAT questions in this session.
- Each NAT question carries 1 or 2 marks.
- There is no negative marking for NAT questions.
- The candidates have to enter the answer using the virtual numeric keypad on the computer screen.
- The total marks for this session range from 0 to 20.

Overall Marking Scheme:
- The total marks for the IIT JAM Chemistry exam range from 0 to 80.
- The final score is calculated by adding the marks obtained in both sessions.
- The final merit list is prepared based on the scores obtained by the candidates.
- In case of a tie, the tie-breaking rule is applied to determine the ranks.

Conclusion:
The marking scheme for the IIT JAM Chemistry exam remains consistent with previous years. It consists of two sessions, each containing a combination of MCQs and NAT questions. The marking scheme includes positive marking for correct answers and negative marking for incorrect answers in the MCQs. However, there is no negative marking for the NAT questions. The final score is calculated by adding the marks obtained in both sessions, and the merit list is prepared based on these scores.