Question

Match the defects given in Column I with the statements in Column II.

$\begin{array}{cccc}& Columnl& & columnll\\ \left(A\right)& simplevacancydefect& \left(i\right)& Shownbynon-ionicsolidsandincreasesdensityofthesolid\\ \left(B\right)& simpleinterstitialdefect& \left(ii\right)& Shownbynon-ionicsolidsanddecreasesdensityofthesolid\\ \left(C\right)& Frenkeldefect& \left(iii\right)& Shownbynon-ionicsolidsanddensityofthesoliddecreases\\ \left(D\right)& schottkydefect& \left(iv\right)& Shownbynon-ionicsolidsanddensityofthesolidremainsthesame\end{array}$

Answer 1

Part (A):

A simple vacancy defect is a point defect that occurs when some of the lattice sites are vacant, resulting in a decrease in the density of the crystal. It is generally shown by
non-ionic solids.

Hence,
(A) → (iii)

Part (B):

In a simple interstitial defect, some constituent atoms occupy the interstitial site. Hence, no change in density, or in some cases, it increases. It is generally shown by non-ionic solids.

Hence,

(B) → (i)

Part (C):

In the Frenkel defect, the cations missing from the lattice positions occupy the interstitial sites. Hence, the density of the crystal remains the same. It is shown by ionic solids.

Hence,
(C) → (iv)

Part (D):

In the Schottky defect, an equal number of cations and anions are missing from their lattice sites, creating vacancies or holes. The decrease in the mass of the ionic crystal, also causes the density of the crystal to decrease.

Hence,
(D) → (ii)
Hence, the correct match is:

$\begin{array}{cccc}& Columnl& & columnll\\ \left(A\right)& simplevacancydefect& \left(i\right)& Shownbynon-ionicsolidsandincreasesdensityofthesolid\\ \left(B\right)& simpleinterstitialdefect& \left(ii\right)& Shownbynon-ionicsolidsanddecreasesdensityofthesolid\\ \left(C\right)& Frenkeldefect& \left(iii\right)& Shownbynon-ionicsolidsanddensityofthesoliddecreases\\ \left(D\right)& schottkydefect& \left(iv\right)& Shownbynon-ionicsolidsanddensityofthesolidremainsthesame\end{array}$