$⊝ \oplus ⊝ O ⊝ \oplus ⊝ \oplus$
$\oplus ⊝ \oplus ⊝ \oplus ⊝ \oplus ⊝$
$⊝ \oplus O \oplus ⊝ \oplus ⊝ \oplus$
$\oplus ⊝ \oplus O \oplus ⊝ \oplus ⊝$
$⊝ \oplus ⊝ \oplus ⊝ O ⊝ \oplus$

(a) What are these types of vacancy defects called?
(b) How is the density of a crystal affected by these defects?
(c) Name one ionic compound which can show this type of defect in the crystalline state.
(d) How is the stoichiometry of the compound affected?

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Solution

(a)Schottky defect:If in an ionic crystal of the type $A + B^{-}$ equal number of cations and anoins are missing from the the lattice site.so electrical neutrality is remain same.
(b)Density decreases due to vacancy of ions from the lattice.
(c)NaCl,KCl
(d) stoichiometry of the compound is not affected.

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Similar questions

Q. Examine the given defective crystal.

\begin{matrix} A^{+} & B^{-} & A^{+} & B^{-} & A^{+} B^{-} & O & B^{-} & A^{+} & B^{-} A^{+} & B^{-} & A^{+} & O & A^{+} B^{-} & A^{+} & B^{-} & A^{+} & B^{-} \end{matrix}

Answer the following questions:
(i) What type of stoichiometric defect is shown by crystal?
(ii) How is the density of the crystal affected by this defect?
(iii) What type of ionic substances show such defect?

Q. Examine the given defective crystal.

\begin{matrix} X^{+} & Y^{-} & X^{+} & Y^{-} & X^{+} Y^{-} & O & Y^{-} & X^{+} & Y^{-} X^{+} & Y^{-} & X^{+} & O & X^{+} Y^{-} & X^{+} & Y^{-} & X^{+} & Y^{-} \end{matrix}

Answer the following questions :

(i) Is the above defect stoichiometric or non-stoichiometric?
(ii) Write the term used for this type of defect. Give an example of the compound which shows this type of defect?
(iii) How does this defect affect the density of the crystal?

How are vacancy defects stoichiometric defects if some atoms are absent? Wouldn't that change the stoichiometry of the compound?

A sample of ferrous oxide has actual formula $F e_{0.93} O_{1.00}$ In this sample, what fraction of metal ions are $F e^{2 +}$ ions ? What type of non-stoichiometry defect is present in this sample?

Q. Examine the given defective crystal

A^{+} B^{-} A^{+} B^{-} A^{+}

B^{-} 0 B^{-} A^{+} B^{-}

A^{+} B^{-} A^{+} 0 A^{+}

B^{-} A^{+} B^{-} A^{+} B^{-}

How is the density of the crystal affected by this defect?
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(a)Schottky defect:If in an ionic crystal of the type A+B− equal number of cations and anoins are missing from the the lattice site.so electrical neutrality is remain same.(b)Density decreases due to vacancy of ions from the lattice.(c)NaCl,KCl(d) stoichiometry of the compound is not affected.