| Assertion: In NaCl crystal, each \[N{{a}^{+}}\] ion is touching six \[C{{l}^{-}}\] ions but these \[C{{l}^{-}}\] ions do not touch each other. |
| Reason: The radius ratio \[{{r}_{N{{a}^{+}}}}/{{r}_{C{{l}^{-}}}}\] is greater than 0.414 required for exact fitting. |
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.
Correct Answer: A
Solution :
NaCl has face centred cubic structure in which each \[N{{a}^{+}}\] is surrounded by 6 ions and vice-versa. In this octahedral arrangement, coordination number of both \[N{{a}^{+}}\] and \[C{{l}^{-}}\] is 6 for which radius ratio lies between 0.414 and 0.732. This radius ratio does not allow \[C{{l}^{-}}\]ions to touch each other.
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