Which statement among the following is not correct?

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Ferrimagnetism arises due to the alignment of magnetic moments of the domains in the substance in parallel and anti-parallel directions in unequal numbers.

Replacing some silicon atoms by phosphorus atoms in crystal of silicon produces p-type semiconductor.

Replacing some germanium atoms by phosphorus atoms in crystal of germanium produces n-type semiconductor.

When conduction band and valence band overlap, a semiconductor is obtained

answer is D.

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Detailed Solution

In case of semiconductor, the gap between valence band and conduction band is small. Therefore, option (4) is incorrect as here it is mentioned that conduction band and valence bond overlaps, which happens in conductors only.
(1), (2) and (3) are correct statements.

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