Short Answer Type

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


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.
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What is the difference between ferromagnetic and ferrimagnetic substances?
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What is the effect of Frenkel defect on electrical conductivity of the solid?
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In an alloy of gold and cadmium, gold crystallizes in cubic structure occupying the corners only and cadmium fits into the face centre voids. What is quantitative composition of the alloy?
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Long Answer Type

What is a semiconductor? Describe two main types of semiconductors, giving examples and their distinctive features.
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Short Answer Type

What other element may be added to silicon to make electrons available for the conduction of electric current?
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Which solid is likely to be the best material for converting sunlight into electricity?
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Which ‘point defect’ lowers the density of ionic crystals?
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What is the difference between glass and quartz, though both contain SiO44– units?
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Long Answer Type

Assign reasons the following:
(i) Phosphorus doped silicon is a semi-conductor.
(ii) Schottky defect lowers the density of a solid.
(iii) Some of the very old glass objects appear slightly milky instead of being transparent.
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