The Solid State

Question 45
CBSEENCH12005393

What kind  point defect lowers the density of a crystal?

Solution
Schottky defect lowers the density of a crystal.
Question 46
CBSEENCH12005394

What do you mean by ‘point defects' in crystals?

Solution
Point defects are caused by missing or misplaced ion or atom in the crystal lattice i.e., deviation from regular arrangement of ions/ particles in the crystal.
Point defects can be classified into three types : (i) stoichiometric defects (ii) impurity defects and (iii) non-stoichiometric defects.
Question 47
CBSEENCH12005395

Define dislocation in crystals.

Solution
crystal defect. Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.
Question 48
CBSEENCH12005396

Explain the term ‘dislocations’ in relation to crystals?

Solution
Crystal defect. Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.

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