Which is the correct statement?

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(C) $1$. Schottky defect is observed in ionic solids where the size of the cation and anion are almost similar.$2$. Frenkel defect is observed in ioni

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Frenkel defect occurs when the radius of the cation is smaller.

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(C) $1$. Schottky defect is observed in ionic solids where the size of the cation and anion are almost similar.$2$. Frenkel defect is observed in ionic solids where there is a large difference in the size of the ions,specifically when the cation is much smaller than the anion,allowing it to occupy interstitial sites.$3$. As temperature increases,the thermal energy of the particles increases,which leads to an increase in the number of defects in a crystal lattice.$4$. Therefore,statement $C$ is correct.

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