The Solid State

Question 225
CBSEENCH12005573

What other element may be added to silicon to make electrons available for the conduction of electric current?

Solution

When doping a semiconductor, such as the group IV element silicon (Si), with arsenic (As), a pentavalent n-type dopant from group V in the periodic table the dopant behaves as an electron donor.

Question 226
CBSEENCH12005574

Why does Frenkel defect not change the density of AgCl crystal?

Solution
In the frenkel defect the ions are not removed from the crystal to maintain electrical neutrality. so there will be no change in the crystal structure. that is there is no decrease in the no of ions.all the ions are inside the crystal.they are only dislocated.
Question 227
CBSEENCH12005575

What is the difference between ferromagnetic and ferrimagnetic substances?

Solution

In ferromagnetic materials, neighboring dipoles tend to line up in the same direction, whereas in ferrimagnetic materials, neighboring dipoles tend to line up in opposing directions.

Question 228
CBSEENCH12005576

Which ‘point defect’ lowers the density of ionic crystals?

Solution

Schottky Defect lowers the density of ionic crystal.

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