8th Nov Solid State Quiz 9 – Punjab Meritorious School Preparation Portal

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The correct statement regarding defects in crystalline solids is

Frenkel defects decrease the density of crystalline solids

Frenkel defect is a dislocation defect

Frenkel defect is found in halides of alkaline metals

Schottky defects have no effect on the density of crystalline solids.

An element (atomic mass = 100 g/mol) having bcc structure has unit cell edge 400 pm. The density of element is

Ionic solids, with Schottky defects, contain in their structure

cation vacancies only

cation vacancies and interstitial cations

equal number of cation and anion vacancies

anion vacancies and interstitial anions.

If NaCl is doped with 10^–4 mol % of SrCl₂, the concentration of cation vacancies will be (N_A = 6.02 × 10²³ mol^–1)

Which is the incorrect statement?

Formula of nickel oxide with metal deficiency defect in its crystal is Ni_0.98O. The crystal contains Ni²⁺ and Ni³⁺ ions. The fraction of nickel existing as Ni²⁺ ions in the crystal is

0.96

0.04

0.50

0.3

If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?

n-type semiconductor

p-type semiconductor

Both (a) and (b)

None of these

Schottky defect in crystals is observed when

density of the crystal is increased

unequal number of cations and anions are missing from the lattice

an ion leaves its normal site and occupies an interstitial site

equal number of cations and anions are missing from the lattice.

With which one of the following elements silicon should be doped so as to give p-type of semiconductor?

Selenium

Boron

Germanium

Arsenic

The appearance of colour in solid alkali metal halides is generally due to

interstitial positions

F-centres

Schottky defect

Frenkel defect.

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