Select the correct statement(s).

Options

A. Due to the pairing of electrons, magnetic moment is cancelled
B. Paramagnetic substances are weakly attracted by magnetic field
C. Ferromagnetic substances cannot be magnetised permanently
D. The domains in anti-ferromagnetic substances are oppositely oriented with respect to each other

Explanation

To solve the question regarding the selection of correct statements about magnetic properties of materials, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze Statement A**:
- The statement claims that "due to pairing of electrons, the magnetic moment is cancelled."
- **Explanation**: When electrons are paired in an orbital, one electron has a spin of +1/2 (up spin) and the other has a spin of -1/2 (down spin). These opposite spins cancel each other out, resulting in no net magnetic moment.
- **Conclusion**: This statement is **correct**.
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