Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: If edge length of unit cell of \[LiCl\], having \[NaCl\] type structure, is \[5.14\overset{\text{o}}{\mathop{\text{A}}}\,\], the ionic radius of \[C{{l}^{-}}\] ion is \[1.82\overset{\text{o}}{\mathop{\text{A}}}\,\]. Reason: Anion-anion contact is retained in \[LiCl\] structure because anions constitute the lattice.A) If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
C) If Assertion: is true but Reason: is false
D) If both Assertion: and Reason: are false
Correct Answer: A
Solution :
If anion-anion contact is retained, \[4{{r}^{-}}=\sqrt{2}a\] \[{{r}^{-}}=\frac{\sqrt{2}\times 5.14}{4}\] \[=1.82\overset{\text{o}}{\mathop{\text{A}}}\,\] Thus, Reason: is the correct explanation o Assertion:.
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