In a permanent magnet at room temperature, [NCERT Exemplar]

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domains are all perfectly aligned

magnetic moment of each molecule is zero

the individual molecules have non-zero magnetic moment which are all perfectly aligned

domains are partially aligned

answer is D.

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Detailed Solution

As, we know a permanent magnet is a substance which at room temperature retain ferromagnetic property for a long period of time.
The individual atoms in a ferromagnetic material possess a dipole moment as in a paramagnetic material.

However, they interact with one another in such a way that they spontaneously align themselves in a common direction over a macroscopic volume called domain. Thus, we can say that in a permanent magnet at room temperature, domains are all perfectly aligned.

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