Statement 1: In NaCl crystal each Na^+ ion is touching 6 Cl^- ions but these Cl^- ions do not touch each other. Statement 2: The radius ratio r_ Na^+ /r_ Cl^- is greater than 0.414 required for exact fitting.

JEE Main Chemistry question

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Statement 1: In NaCl crystal each ion is touching 6 ions but these ions do not touch each other. Statement 2: The radius ratio is greater than 0.414 required for exact fitting.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

In the NaCl structure, each ion is indeed octahedrally surrounded by 6 ions, and because exceeds the minimum value of 0.414 needed for exact octahedral fitting, the cation is slightly larger than the minimum size

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Question ID VK-141627