Match the types of defect given in Column I with the statement given in Column II-Column I-Column IIINhlineA-Impurity defect-1-NaCl with anionic sites called F-centresllB-Metal excess defect-2-FeO - with - Fe -3- UNC-Metal deficiency defect-3-NaCl with Sr2- and some cationic sites vacantllhlineend array

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Standard XII

Chemistry

Metal Deficiency Defect

Match the typ...

Question

Match the types of defect given in Column I with the statement given in Column II.

$\begin{matrix} C o l u m n I & C o l u m n I I A . I m p u r i t y d e f e c t & 1. N a C l w i t h a n i o n i c s i t e s c a l l e d F - c e n t r e s B . M e t a l e x c e s s d e f e c t & 2. F e O w i t h F e^{3 +} C . M e t a l d e f i c i e n c y d e f e c t & 3. N a C l w i t h S r^{2 +} a n d s o m e c a t i o n i c s i t e s v a c a n t \end{matrix}$

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Solution

A. $\to$ (3) B. $\to$ (1) C. $\to$ (2)

A. impurity defect arises due to replacement of one common ion present in any crystal by another uncommon ion.

B. Metal excess defect is due to missing of cation from ideal lonic solid which lead to create a F-centre generally occupied by unpaired electrons. e.g., NaCI with anionic site.

C. Metal deficiency defect in FeO, $F e^{3 +}$ exista along with $F e^{3 +}$ which lead to decrease in metal ion (s) so this is a type of metal deficiency defect.

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

$\begin{matrix} C o l u m n I & C o l u m n I I A . & s i m p l e v a c a n c y d e f e c t & 1. S h o w n b y n o n - i o n i c s o l i d s a n d i n c r e a s e s d e n s i t y o f t h e s o l i d B . & S i m p l e i n t e r s t i t i a l d e f e c t & 2. S h o w n b y i o n i c s o l i d s a n d d e c r e a s e s d e n s i t y o f t h e s o l i d c . & F r e n k e l d e f e c t & 3. S h o w n b y n o n - i o n i c s o l i d s a n d d e n s i t y o f t h e s o l i d d e c r e a s e s D . & S c h o t t k y d e f e c t & 4. S h o w n b y i o n i c s o l i d s a n d d e n s i t y o f t h e s o l i d r e m a i n s t h e s a m e \end{matrix}$

Cations are present in the interstitial sites in ...........

(a) Frenkel defect (b) Schottky defect

Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

Question: In metal excess defect

Q. Assertion :Schottky defect is generally shown by the compounds with high co-ordination number. Reason: In Schottky defect, equal number of anions and cations are missing from their lattice sites.

In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

What is the effect of metal excess defect on density of the crystal?

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Match the types of defect given in Column I with the statement given in Column II. Column IColumn IIA.Impurity defect1.NaCl with anionic sites called F−centresB.Metal excess defect2.FeO with Fe3+ C.Metal deficiency defect3.NaCl with Sr2+ and some cationic sites vacant