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Statement I: In any ionic solid [MX] wit...

Statement I: In any ionic solid `[MX]` with Schottky defect, the number of positive and negative ions are same.
Statement II: An equal number of cation and anion vacancies is present.

A

If both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT -1

B

If both the statement are TRUE and STATEMENT -2 is the not correct explanation of STATEMENT -1

C

If STATEMENT -1 is the correcct and TRUE and STATEMENT -2 is FALSE

D

If STATEMENT -1 is the correcct and FALSE and STATEMENT -2 is TRUE

Text Solution

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The correct Answer is:
To solve the question, we need to analyze both statements regarding ionic solids with Schottky defects. ### Step-by-Step Solution: 1. **Understanding Schottky Defect**: - A Schottky defect is a type of point defect in ionic solids where equal numbers of cations (positive ions) and anions (negative ions) are missing from their lattice sites. - This results in vacancies in the crystal lattice. 2. **Statement I Analysis**: - Statement I claims that in any ionic solid [MX] with a Schottky defect, the number of positive and negative ions is the same. - Since Schottky defects involve the removal of equal numbers of cations and anions, the overall charge balance (electrical neutrality) of the solid is maintained. - Therefore, this statement is **true**. 3. **Statement II Analysis**: - Statement II states that an equal number of cation and anion vacancies are present. - Since the Schottky defect involves the removal of equal numbers of cations and anions, it logically follows that the number of vacancies created for cations and anions will also be equal. - Hence, this statement is also **true**. 4. **Conclusion**: - Both statements are correct. - Statement II serves as the correct explanation for Statement I, as the equal number of cation and anion vacancies directly supports the claim that the number of positive and negative ions remains the same. ### Final Answer: - Both Statement I and Statement II are true, and Statement II is the correct explanation for Statement I. ---
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In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice. Assertion : In any ionic solid [MX] with schottky defects, the number of positive and negative ions are same. Reason : Equal number of cation and aniojn vacancies are present .

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 ?

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