Which of the following statementl is/are correct as per IUPAC sign convention?

Options

A. The work done by the system on the surrounding is negative
B. The work done by the surrounding on the system is positive
C. The heat absorbed by the system from the surrounding is positive
D. The heat absorbed by the surrounding from the system is positive

Explanation

To determine which statements are correct according to the IUPAC sign convention, we need to analyze the definitions of work and heat in thermodynamics.

### Step-by-Step Solution:

1. **Understanding the System and Surroundings**:
- Define the system as the part of the universe we are focusing on, while the surroundings are everything else.
- Identify the direction of energy transfer (work and heat) between the system and surroundings.

2. **Work Done by the System**:
- According to IUPAC sign convention, if the system does work on the surroundings, this is considered negative.
- **Example**: If a gas expands and pushes against the piston, it does work on the surroundings, hence the work done is negative.

3. **Work Done on the System**:
- Conversely, if the surroundings do work on the system, this is considered positive.
- **Example**: If the piston compresses the gas, work is done on the system, thus the work done is positive.

4. **Heat Absorption by the System**:
- Heat absorbed by the system from the surroundings is considered positive.
- **Example**: If the system gains heat, it increases in energy, so this is a positive transfer.

5. **Heat Released by the System**:
- Heat released by the system to the surroundings is considered negative.
- **Example**: If the system loses heat, it decreases in energy, hence this is a negative transfer.

### Summary of Statements:
- Work done by the system on the surroundings is negative (Correct).
- Work done by the surroundings on the system is positive (Correct).
- Heat absorbed by the system is positive (Correct).
- Heat absorbed by the surroundings from the system is negative (Correct).

### Final Conclusion:
All the statements provided are correct as per the IUPAC sign convention.