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Which of the following is not a point defect?

Which of the following is not a point defect? Correct Answer Dislocation

When the deviation from the periodic arrangement of the lattice is localized to the vicinity of only a few atoms or single atom, it is called a point defect, or point imperfection. The vacancy, interstitial atom, impurity atoms are only single lattice point defects. But dislocation is line defect.

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