Select the incorrect statement.

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(D) $1$. $F$-centres (Farbe centres) are anionic vacancies occupied by electrons,which impart colour to the crystal. This is a correct statement.$2$.

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There are four unit cells in tetragonal crystal system.

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(D) $1$. $F$-centres (Farbe centres) are anionic vacancies occupied by electrons,which impart colour to the crystal. This is a correct statement.$2$. Schottky defect involves the loss of equal numbers of cations and anions,maintaining the electrical neutrality and stoichiometry of the crystal. This is a correct statement.$3$. In an orthorhombic crystal system,the axial angles are $\alpha = \beta = \gamma = 90^o$. This is a correct statement.$4$. The tetragonal crystal system consists of only two types of unit cells: primitive (simple) and body-centred. There are not four unit cells. Therefore,this statement is incorrect.

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