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

Options

A. If both assertion and reason are true, and reason is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If assertion is true , but reason is false
D. If both assertion and reason are false.

Answer

A

Explanation

If anion-anion contact is retained, then is shown in the adjoininig

Interionic distance of LiCl =`a/2`
`="5.14 Å"/2`=2.57 Å
`BC=sqrt(AB^2+AC^2)=sqrt((2.57)^2+(2.57)^2)`
=3.63 Å
Radius of `Cl^-` ion =`1/2BC =1/2xx3.63`=1.81 Å
Hence , R is the correct explanation of A.