`Al^(3+)` ions replace `Na^(+)` ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to be x ` 10^(23)`. The value of x approximately is

`Al^(3+)` ions replace `Na^(+)` ions at the edge centres of NaCl latti

1.	`Al^(3+)` ions replace `Na^(+)` ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to be x ` 10^(23)`. The value of x approximately is
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`Al^(3+)` ions replace `Na^(+)` ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to be x ` 10^(23)`. The value of x approximately is

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