Imperfections in Solids

Match the following:

No crystal is found to be prefect at room temperature. The defects present in the crystals can be stoichiometric or non-stoichiometric. Due to nonstoichiometric defects, the formula of the ionic compound is different from the ideal formula. For example, the ideal formula of ferrous oxide should be $\mathrm{FeO}$ but actually in one sample, it was found to be ${\mathrm{Fe}}_{0.93}\mathrm{O}$. This is because the crystal may have some ferric ions in place of ferrous ions. These defects change the properties of the crystals. In some cases, defects are introduced to have crystals of desired properties as required in the field of electronics. Doping of elements of Group 14 with those of Group 13 or 15 is most common. In ionic compounds, usually impurities are introduced in which the cation has higher valency than the cation of the parent crystal, e.g., ${\mathrm{SrCl}}_2$ into $\mathrm{NaCl}$.

Which one of the following defects does not affect the density of the crystal ?

Which is/are incorrect for Schottky defect in rock salt type crystals:

Which one of the following has both Schottky and Frenkel defects?

Frenkel and Schottky defects are:

Schottky Defect does not change the density of the solid.

Frenkel and Schottky defects are:

Transition metals show variable _____  states. Moreover, they have vacancies present in their metal lattice. Thus, they form interstitial compounds.

How are the  properties of crystals affected by Schottky and Frenkel defects? Electrical conductivity

How are the properties of crystals affected by Schottky and Frenkel defects? Density 
 

What type of defect is shown by $\mathrm{KCl}$ and why?

Which non-stoichiometric point defect responsible for colour in alkali metal halides?

Which point defects in its crystal units alters the density of a solid?

Why are the defects of the crystalline solids called thermodynamic defects?

The composition of a sample of Wustite is ${\mathrm{Fe}}_{0.93}{\mathrm{O}}_{1.00}$. The percentage of $\mathrm{Fe} \left(\mathrm{III}\right)$ ions present in the sample is about

Experiment shows that Nickel oxide has the formula ${\mathrm{Ni}}_{0.96}{\mathrm{O}}_{1.00}$. What fraction of Nickel exists as of ${\mathrm{Ni}}^{2+}$ and ${\mathrm{Ni}}^{3+}$ ions?

The composition of a sample of wurtzite is ${\mathrm{Fe}}_{0.93}{\mathrm{O}}_{1.00}$ what $\%$ of Iron present in the form of ${\mathrm{Fe}}^{3+}$?

What is Frenkel defect? how does it affect density of the solid?