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Statement : Schottky defect is generally...

Statement `:` Schottky defect is generally shown by the compounds with high co`-` ordination no.
Explanation `:` Equal no. of cations and anions are missing from the lattice sites in Schottky defect.

A

If both assertion and reason are correct and reason is correct explanation for assertion

B

If both assertion and reason are correct but reason is not correct explanation for assertion

C

If assertion is correct but reason is incorrect

D

If both assertion and reason are incorrect

Text Solution

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The correct Answer is:
To solve the question regarding the Schottky defect, we will analyze the assertion and the reason provided in the statement. ### Step-by-Step Solution: 1. **Understanding Schottky Defect**: - A Schottky defect occurs in ionic solids when equal numbers of cations and anions are missing from their lattice sites. This defect is a type of point defect that maintains electrical neutrality in the crystal structure. **Hint**: Recall that in ionic compounds, maintaining electrical neutrality is crucial when defects occur. 2. **Analyzing the Assertion**: - The assertion states that "Schottky defect is generally shown by the compounds with high coordination number." This is true because compounds with high coordination numbers can accommodate the missing ions without significantly disrupting the overall structure. **Hint**: Consider how coordination number affects the stability and arrangement of ions in a crystal lattice. 3. **Analyzing the Reason**: - The reason states that "Equal number of cations and anions are missing from the lattice sites in Schottky defect." This is also true and is a defining characteristic of Schottky defects. **Hint**: Think about why equal numbers of cations and anions are necessary for maintaining charge balance in the lattice. 4. **Evaluating the Relationship**: - While both the assertion and reason are correct, the reason does not explain why Schottky defects are associated with high coordination numbers. The reason describes the nature of the defect but does not justify the assertion regarding coordination number. **Hint**: Reflect on the difference between stating a fact and providing an explanation for that fact. 5. **Conclusion**: - Since both the assertion and reason are correct, but the reason does not adequately explain the assertion, the correct answer is that both assertion and reason are correct, but the reason is not the correct explanation for the assertion. ### Final Answer: The correct option is: **Option 2** - Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.
To solve the question regarding the Schottky defect, we will analyze the assertion and the reason provided in the statement. ### Step-by-Step Solution: 1. **Understanding Schottky Defect**: - A Schottky defect occurs in ionic solids when equal numbers of cations and anions are missing from their lattice sites. This defect is a type of point defect that maintains electrical neutrality in the crystal structure. **Hint**: Recall that in ionic compounds, maintaining electrical neutrality is crucial when defects occur. ...
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Schottky defect is generally observed in :

Statement-1 :Schottky type of defect is shown by crystals with high co-ordination numbers . Statement-2 :In Schottky defect , equal number of cations and anions are missing from their lattice sites

Schottky defect occurs mainly in electrovalent compounds where

Schottky defect occurs mainly in electrovalent compounds where

Explan how Schottky defect occurs.

A : In Schottky defect, density of crystal decreases. R : Equal number of cations and anions are missing in Schottky defect.

Assertion (A) : The density of crystal having Schottky defect is lowered. Reason (R ) : The crystals suffering from Schottky defect have same number of cation and anions missing from their normal lattice sites.

Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. In a crystal some ions are missing from normal sites. This is an example of

Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. Which of the following defect, if present, lowers the density of the crystal ?

Statement : Due to Frenkel defect the density of the crystalline solid remains same. Explanation : In Frenkel defect, no cations or anions leave the lattice.