Assertion:If the length of the unit cell of `LICI` having `NaCI` structure is `5.14 Å `, the ionic radius of `CI^(-)` ion is `.82 Å`
Rason : Anion- anion contact is retaned in`LiCI` structure because anion constitute the lattice

Answer

d

Explanation

If anion -anion contact is retained , then as shown in the adjoining fig,

Interionic distance of LiCl = `a/2`
` ( 5.14 Å)/2 = 2.57Å `
`BC = sqrt(AB^(2) + AC^(2)) = sqrt((2.57)^(2) + ( 2.57)^(2))` = 3.63 Å
Radius of ` Cl^(-) "ion" = 1/2 BC = 1/2 xx 3.63= 1.81 Å`
Hecne, R is the correct explanation of A.