Assertion : When 1.0 mol of NaCl is doped with `10^(-3)` mol `SrCl_(2)`, the number of cationic sites remaining vacant is `10^(-3)`.
Reason : Each `SrCl_(2)` unit produces two cation vacancies.

Options

A. If both (A) and ( R) are correct and ( R) is the correct explanation of(A).
B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).
C. If (A) is correct, but ( R) is incorrect.
D. If both (A) and ( R) are incorrect.

Answer

D

Explanation

As each `SrCl_(2)` unit creates one cation vacancy, number of cation vacancies will be `10^(-3)` mol = `10^(-3)xx(6.02xx10^(23))=6.02xx10^(20)`. Each `SrCl_(2)` produces one cation vacancy.