Question

Write type of defect in NaCl crystal

Answer 1

Metal excess defect.When crystals of NaCl are heated in an atmosphere of sodium vapour, the sodium atoms are deposited on the surface of thecrystal. The Cl– ions diffuse to the surface of the crystal and combine with Na atoms to give NaCl. this happens by the loss of electron by sodium atoms to firm sodium ions. The released electrons then diffuse into the crystals occupying the anionic sites. As a result the crystal has more number of sodium.

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Answer 2

there are three types of crystal defects:

1. point defects
2. line defects
3. plane defects