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Assertion: In sodium crystal, the co-ord...

Assertion: In sodium crystal, the co-ordination number of `Na^(+)` ion is six
Reason: Sodium atom is smaller in size than chlorine atom

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

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that in a sodium crystal, the coordination number of the Na⁺ ion is 6. - **Coordination Number**: This refers to the number of nearest neighbors surrounding a central ion in a crystal lattice. ### Step 2: Analyze the Structure of NaCl In the sodium chloride (NaCl) crystal structure: - The Cl⁻ ions form a face-centered cubic (FCC) lattice. - The Na⁺ ions occupy the octahedral voids in this lattice. ### Step 3: Determine the Coordination Number of Na⁺ - In an octahedral void, there are 6 surrounding ions. Therefore, the coordination number of Na⁺ in NaCl is indeed 6. ### Conclusion for Assertion - The assertion is **true**: the coordination number of Na⁺ in sodium crystals is 6. ### Step 4: Understand the Reason The reason states that sodium atom is smaller in size than chlorine atom. ### Step 5: Analyze the Size Comparison - While it is true that the sodium atom (Na) is smaller than the chlorine atom (Cl), this size difference does not directly explain why the coordination number of Na⁺ is 6. ### Conclusion for Reason - The reason is **true**, but it does not provide the correct explanation for the assertion. The coordination number is determined by the position of Na⁺ in the octahedral voids, not solely by its size. ### Final Conclusion Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion. ### Answer The correct answer is: Both assertion and reason are correct, but the reason is not the correct explanation for the assertion. ---
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that in a sodium crystal, the coordination number of the Na⁺ ion is 6. - **Coordination Number**: This refers to the number of nearest neighbors surrounding a central ion in a crystal lattice. ### Step 2: Analyze the Structure of NaCl ...
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