Antiferromagnetic substance possess:

Options

A. Low magnetic moment
B. Large magnetic moment
C. Zero magnetic moment
D. Non-zero value of magnetic moment

Answer

To solve the question regarding the properties of antiferromagnetic substances, we can break it down step by step.

### Step-by-Step Solution:

1. **Understanding Antiferromagnetism**:
- Antiferromagnetic substances are materials in which the magnetic moments of atoms or ions align in opposite directions. This means that for every magnetic moment pointing in one direction, there is an equal magnetic moment pointing in the opposite direction.

**Hint**: Remember that in antiferromagnetic materials, the alignment of magnetic moments is crucial to understanding their overall magnetic properties.

2. **Magnetic Moment Cancellation**:
- Due to the opposite alignment of the magnetic moments, they cancel each other out. If there are equal numbers of magnetic moments in opposite directions, the net magnetic moment of the substance becomes zero.

**Hint**: Think about how vectors work; if you have equal and opposite vectors, they sum to zero.

3. **Conclusion on Magnetic Moment**:
- Since the magnetic moments cancel each other out, the net magnetic moment of an antiferromagnetic substance is zero. Therefore, the correct answer to the question is that antiferromagnetic substances possess zero magnetic moment.

**Hint**: Visualize the arrangement of magnetic moments as arrows pointing in opposite directions; this will help you see why they cancel out.

### Final Answer:
Antiferromagnetic substances possess **zero magnetic moment**.